I very much like the idea of this. In the interest of driving this less in the direction of wouldn't-this-be-cool and more in the direction of actual awesomeness, I think it would be useful to list skills that we have that we feel qualified and willing to teach. I'll go first:

1. Juggling
2. Go (I am only around 5k, but I have a pretty solid understanding of the fundamentals and can certainly give a good introduction to the game)
3. Programming
4. Cooking (probably best not to start with this one, though)

If anyone is interested in learning these things or sharing their knowledge, I'd love to hold a meetup to that end. It would be informal and depending on the activity might have to be limited to a small group. I am based in San Francisco, so it would be held here, probably somewhere in the Mission District. Reply or PM me if you want to participate and I'll arrange something in the next week or two if there's enough interest. Ok!