People tend to check in during these times:
summer a/c is super chilly - bring a sweater!
The only department off campus go IS!
Highest paying student job is at the CIT help desk...
Convince the overworked grad students to take a study break and play Smash on the Wii with you.
Walk in and say hi to the grad students. Learn something about IS research and courses.
Graduate students are smart but can be disarmed with kindness and jokes.