BabyScientist

First, it's still very early, you already have one interview invite and you could get more. You're freaking out too early. 
Contacting professors isn't required and likely isn't the problem, so don't worry about that.
Your GRE scores are fine and no one cares about the GRE anymore anyway.
You asked if you should reapply if you don't get enough interview offers, but it should be "should I reapply if I don't get the right admissions offer". You only need to get into one school, and you only need to really like one school. UVA is amazing if you're interested in neuron-glia interactions, and I absolutely loved it when I interviewed. It could be the one.
If you don't get in anywhere: re-evaluate your SOP - that and LORs are the most important component and a lot of people unknowingly throw red flags into their SOPs. 
But again, you're worrying about this wayyyy too early. I continued to get interview invites until mid January. Just because people have started to get them and some people have gotten so many doesn't mean there aren't still so many more to come. Chill. You got this. 

They will likely already have your CV in front of them. I printed out a bunch and over 7 schools and who knows how many interviews never had to pull one out.
As far as previous research: if there's something about your research that's really not easy to talk about without visuals, feel free to bring a visual aid, but it really isn't otherwise necessary. You're having a conversation, not giving a presentation. If you can just discuss, that works.
You don't really have to have read about any of their work or have preset questions about their work. They'll tell you about it there and you can ask whatever you want to about it. If you happen to be super interested and just have a question that you didn't plan, great, ask it. It shouldn't seem inorganic. I read a ton of papers before my first recruitment weekend, couldn't keep em all straight in my head, and they never came up because they all just started telling me about their work without asking if I already knew about it. Didn't prep for the rest of the recruitment weekends.
I have to emphasize that it's supposed to be a conversation with someone who could one day be your mentor. They know you're academically qualified. They want to see your enthusiasm and personal skills. They want to get to know *you*, so be yourself.

There are no rules. Christmas and new years are unlikely but other than that it can be any time.

It's too early to be in disaster mode. Get off gradcafe. Stop looking at the results page. It's unhealthy during this stage of applications.
IF (and I must emphasize IF) you don't get in anywhere this cycle, start with your SOP. Have others read it, think about it from the perspective of an adcomm. Did you convey why you want to go to grad school or just regurgitate your CV? Did you mention specific things you like about that school, or just name the school? Did you inadvertently put in any red flags?
Then consider who wrote your LORs. Maybe there was one you weren't sure about?
And reconsider the schools. Did you only apply to top tier schools that your average GPA may hold you back from?
Again, it's too early for this. Relax. Breathe. It'll be okay. 

First, it's still very early, you already have one interview invite and you could get more. You're freaking out too early. 
Contacting professors isn't required and likely isn't the problem, so don't worry about that.
Your GRE scores are fine and no one cares about the GRE anymore anyway.
You asked if you should reapply if you don't get enough interview offers, but it should be "should I reapply if I don't get the right admissions offer". You only need to get into one school, and you only need to really like one school. UVA is amazing if you're interested in neuron-glia interactions, and I absolutely loved it when I interviewed. It could be the one.
If you don't get in anywhere: re-evaluate your SOP - that and LORs are the most important component and a lot of people unknowingly throw red flags into their SOPs. 
But again, you're worrying about this wayyyy too early. I continued to get interview invites until mid January. Just because people have started to get them and some people have gotten so many doesn't mean there aren't still so many more to come. Chill. You got this. 

First, it's still very early, you already have one interview invite and you could get more. You're freaking out too early. 
Contacting professors isn't required and likely isn't the problem, so don't worry about that.
Your GRE scores are fine and no one cares about the GRE anymore anyway.
You asked if you should reapply if you don't get enough interview offers, but it should be "should I reapply if I don't get the right admissions offer". You only need to get into one school, and you only need to really like one school. UVA is amazing if you're interested in neuron-glia interactions, and I absolutely loved it when I interviewed. It could be the one.
If you don't get in anywhere: re-evaluate your SOP - that and LORs are the most important component and a lot of people unknowingly throw red flags into their SOPs. 
But again, you're worrying about this wayyyy too early. I continued to get interview invites until mid January. Just because people have started to get them and some people have gotten so many doesn't mean there aren't still so many more to come. Chill. You got this. 

Most are sent out by the end of January. Some can sprinkle in as late as March.

I would have done that before submitting. If you contact 3 people you're interested in at a certain school now, and none of them are taking students, why did you apply to that school?
Contacting people in advance doesn't change your odds of acceptance. They won't be going out of their way to help you get in just because you sent them a nice email. That being said, if you're just genuinely interested in their work and want to talk to them about it, you could reach out and just say something like "I've submitted my application for the fall, and am very interested in your work because xyz. I was hoping you'd have some time to talk about your work." 

Publications only unless they ask for abstracts/presentations. Cite presentations on your CV. 

Not a dumb question at all! 
I contacted faculty before applying, if only to establish a connection in case I did get an interview. I chose the top people I was interested in and sent them an email explaining that I was applying and was interested in their work. I described some of my past experiences in the field, then I explained exactly what they did that was of interest to me and how it relates to my interests or past experiences (not in great detail or anything). The only questions I really asked were "Do you know if you'll be taking students next year?" and "Would you be able to speak over the phone sometime to further discuss my interests?" Bonus points if you have actual questions about their research, but they better be well-informed questions. I did have a few phone calls with faculty - I told them about my interests and why that program is exciting to me. They told me about their research, and even gave me some tips about the program that helped me bolster my SOP for that program.
This was all for neuroscience PhD programs.
Feel free to PM me and I can send you examples of my emails or answer more questions.

GRE really isn't a big part of the application. It can't really hurt you. I wouldn't spend the time/money on it

Agreed with above.
They can't make assumptions when you don't submit scores. For all they know, you couldn't afford to take it or send them. Or you thought 80th percentiles were low and didn't send them.
Only submit if you think your scores can help you. 

I'll be there as well! And at the grad school fair for at least part of it. 

The GRE really isn't that critical. They'll look at it, sure, but it won't discount your 4.0 or your experience. They say GRE scores can only help, not hurt you. 
That being said, if you can take it again, no reason why not. A month is plenty to study and take it again. If you're going to retake it, make sure you take a bunch of timed, online practice tests, and practice your vocab. Just remember that it isn't the most important thing on your application.

The GRE really isn't that critical. They'll look at it, sure, but it won't discount your 4.0 or your experience. They say GRE scores can only help, not hurt you. 
That being said, if you can take it again, no reason why not. A month is plenty to study and take it again. If you're going to retake it, make sure you take a bunch of timed, online practice tests, and practice your vocab. Just remember that it isn't the most important thing on your application.

Not a dumb question at all! 
I contacted faculty before applying, if only to establish a connection in case I did get an interview. I chose the top people I was interested in and sent them an email explaining that I was applying and was interested in their work. I described some of my past experiences in the field, then I explained exactly what they did that was of interest to me and how it relates to my interests or past experiences (not in great detail or anything). The only questions I really asked were "Do you know if you'll be taking students next year?" and "Would you be able to speak over the phone sometime to further discuss my interests?" Bonus points if you have actual questions about their research, but they better be well-informed questions. I did have a few phone calls with faculty - I told them about my interests and why that program is exciting to me. They told me about their research, and even gave me some tips about the program that helped me bolster my SOP for that program.
This was all for neuroscience PhD programs.
Feel free to PM me and I can send you examples of my emails or answer more questions.

Agreed on this generally, except that I know some people are just really set on starting next year. If you just really want/need to get into grad school, nothing wrong with applying to some schools you might not have otherwise considered. I ended up loving my initial least favorite schools and hating my initial tops. You get a different view after interviews. One of my "safeties" ended up being the main contender to the program I ended up choosing because at interviews I learned that they had some of the biggest names in a specialized subfield I was interested in, even though they didn't generally have as good a reputation as some other schools I got into.
Moral of the story: focus on schools with faculty doing stuff you're interested in, not well known schools. Don't Google schools and check their faculty lists, Google people and check where they are. Ultimately the research you do is most important (not that institutions reputations don't matter, but if you can be successful in a lab matters more). 

Agreed on this generally, except that I know some people are just really set on starting next year. If you just really want/need to get into grad school, nothing wrong with applying to some schools you might not have otherwise considered. I ended up loving my initial least favorite schools and hating my initial tops. You get a different view after interviews. One of my "safeties" ended up being the main contender to the program I ended up choosing because at interviews I learned that they had some of the biggest names in a specialized subfield I was interested in, even though they didn't generally have as good a reputation as some other schools I got into.
Moral of the story: focus on schools with faculty doing stuff you're interested in, not well known schools. Don't Google schools and check their faculty lists, Google people and check where they are. Ultimately the research you do is most important (not that institutions reputations don't matter, but if you can be successful in a lab matters more). 

That's not the standard in the US, but it's not unusual to at least contact faculty to express interest. 

I think you have a very solid application. There's nothing that jumps out as could hold you back. As long as you have great letters of rec and a strong SOP, your list looks fine. As I say to everyone, though, make sure you're actually interested in at least 3 faculty at each school.
As far as school suggestions, I think Brandeis has great people doing membrane trafficking stuff.
I think your special bonus points and any other info comments could both be looked at as very interesting by admissions committees. If cancer is relevant to why you want to go into research, you should mention that in your SOP.

Is your GPA low enough that your GRE scores might help? Otherwise I don't think you need to spend the money on it. 

I've never heard of any schools that strictly reject based on numbers alone (like the automated kind I've heard about for med schools). I think you might as well apply!

I've been told by advisors who have been on admissions committees that schools like Harvard (including someone who was specifically in an adcom at Harvard) that can afford to be super picky have an administrative person do a first run through to remove anyone with lower GPAs and nothing else that stands out (ie a LOR from someone super notable, extreme circumstances explaining the GPA, a first author publication in Science, etc). Was also told by the program director herself that BU Neuro does this (probably less picky than Harvard). I suppose it's also program-dependent.
Can't confirm, just what I've been told.

Not a dumb question at all! 
I contacted faculty before applying, if only to establish a connection in case I did get an interview. I chose the top people I was interested in and sent them an email explaining that I was applying and was interested in their work. I described some of my past experiences in the field, then I explained exactly what they did that was of interest to me and how it relates to my interests or past experiences (not in great detail or anything). The only questions I really asked were "Do you know if you'll be taking students next year?" and "Would you be able to speak over the phone sometime to further discuss my interests?" Bonus points if you have actual questions about their research, but they better be well-informed questions. I did have a few phone calls with faculty - I told them about my interests and why that program is exciting to me. They told me about their research, and even gave me some tips about the program that helped me bolster my SOP for that program.
This was all for neuroscience PhD programs.
Feel free to PM me and I can send you examples of my emails or answer more questions.

Does that invalidate my experiences and those of all the upperclassmen I've communicated with? I've been in the field of biomedical research for years. I've been around enough PhD students and PhD programs to know what is expected in and by them. 
We have a support system in place in my program exactly for this reason. Our administration has warned that if at any point we feel we aren't being treated well in our opinion, we should go to them. My being a first year is irrelevant to what I know a graduate program is supposed to be. In fact, it may even strengthen my opinion, as I've just recently been through all the recruitment events in which they tell you what PhD programs are all about and what to expect.