Talks are a really good idea!
In vancouver, we have been explicitly doing math skillshares for a few meetups. I've also been planning math talks for the local hackerspace. People seem to like math once you get it out of a "this will be on the midterm" context. I'll go ahead and recommend math talks.
The last Megameetup was held when the DC and Cambridge groups both wanted to visit New York. It's a nice average between DC And Cambridge, and other groups didn't respond to the previous thread. On top of that, Geoff has a large venue that he's willing to let us use for free.
If more Southern groups bring it up, there's a chance of it being held in the South, but you guys might need to organize it in your own. I'm happy to help.
One thing that I'd like to see at the next megameetup is a few informal focused discussions on various topics related to the community, like meditation or diet.
People should prepare for them, but I don't think that say, powerpoints would be necessary. Just trying to encourage knowledge transfer.
Anyone on the East Coast interested in giving one? Any things you'd like to see?
Schedule Update: The Megameetup will be held on on the weekend of January 27th or February 4th.