Learn: Stanford University's newest semester is now available on iTunes U. Developing iOS 7 Apps for iPhone and iPad.
Socializing — 6PM until 6:30ish — Make new friends, find a study group or study partner, or just practice your people skills. :-)
Xcoding — That's what it's all about, right? During a typical Meetup people work on the Stanford assignments, ask other members questions, ask for help with a bug, etc. There is no set agenda and no formal presentation. If you prefer to sit in a corner and code away, you can do that. If you want to walk around offering people a helping hand, you can do that too.