In this case I would say business casual was the norm, as someone from Florida it was what I considered cold so some wore blazers or nice looking sweaters or jackets too.
Yes, I literally just did that. I treated the visit like an interview in the sense that I needed to give a good impression and show interest in the program. However, I also was not asked specific questions nor was the visit treated like a selection tool so it wasn't the same as if I was formally interviewed while I was there.
Only 2 people? Wow. Also, it's interesting how different people get different information as nothing about the number of people was mentioned in my email.