Ask HN: Creating a "Hackers Society"

Hi, I am thinking of creating a new society at my college. I'd like to bring together some hackers; the idea is to be able to meet like-minded people. Typically, societies meet up once or twice a week. My question: any ideas on what could be done during such a meeting (typically 1-2 hours)? Some possible things include: - short (10min) lectures on interesting stuff - programming competitions - forming up into teams to work on individual projects - ... However, this is all still very rough. If you guys have any better/more concrete ideas, I'd be very glad to hear them!