2. The footer is good.
3. The main content area needs work. I'd remove the social stuff from there, you already have it in your footer.
4. Where is your call to action? Those two categories in your main content area should be large buttons with a bgcolor that makes them pop a bit.
5. It's a tough sell for me with Meetup.com, I'd start doing some active promotion on there by signing up for tech groups or emailing the leaders to see if they would be interested in listing themselves on your site (or you do it for them).
6. You already know my general location (guestimate), so show me example meetups straight from your main page and list my location. Urge me to change. You already got me on your site, sell me. Don't make me click through another page, I already lost interest. I want to see value add when I hit your page. I want to know you have content pertinent to me.