Lead, I think if you're looking for stimulating conversation (and assuming you're an academic type), try getting to know your fellow lady classmates better. They're likely to have some opinions, and not about your 'pregnancy'. I don't think you're going to find any lifelong friends at a kegger, so don't expect anything if you go to one
You're right about the cattiness though, and I'm guessing that's why you get along with older women in general. They're less catty! Go for someone who looks confident and happy, and isn't bitching about her life or insulting others all the time.