Etiquette on staying with a grad student?

[NewScientist12]

So I have a friend living right outside the university where I'm interviewing. The plan is to stay with a grad student for two nights and go to the airport the next morning. The last official event before the airport is a dinner party from 6 to ~9pm.

Do you think it would be bad etiquette to leave the grad student's house the second night to go hang out with my friend? On one hand - it will save the student a ride to the airport and back, as well as the burden to not house a guest for another night. Plus I'll be able to have some fun in the city without the vigilance from feeling like I'm being watched even at the social events. On the other hand, I can see how it might appear anti-social. Further complicated because the grad students apparently have some say in the admissions process, according to the website.

Thoughts?

[crazygirl2012]

My guess is that it would be okay as long as you are upfront about your plans. You're not obligated to stay past 9 pm on the second night. Other applicants may live in the area and decide to drive home that night. There's nothing wrong with that. You will probably need to go back to the student's house to get your things, but if your friend can pick you up from their house, I see no issue with it. Just email them and let them know that your plans have changed and that you will no longer require housing for a second night or a ride to the airport. Ask if you should inform anyone else (such as a student liaison) of your change in plans. As long as you're gracious about it, you should be fine.