If you're a neuroscientist, check out the cognitive science talks. If you're a cognitive scientist, check out the neuroscience talks. Even if you don't know anything about neurobiology or anatomy, at the very least there should be free food. As a grad student, free food is an important part of life. Cruise by 15 minutes into the reception.
Classes are classes.
You've been taking them since the first grade. As I've said before, research will be the most important part of your work here. The best part of classes really seems to be teaching them. All second year grad students TA for Introduction to Psychology , a class taught by Steve Pinker . When I first started, I kind of approached teaching as a chore, but as I got to know my students, the class turned into a lot of fun.