We can define transhumanism as "simplified humanism" (http://yudkowsky.net/singularity/simplified/). Humanism might strive for intelligence, unless your IQ is already 150. Strive for survival, unless you've already lived to a "ripe" old age of 100. Strive for happiness. Unless you're already happy. Humanism says there is a "good enough".
Transhumanism says fuck that. It wants unlimited intelligence, unlimited life and unlimited happiness. Why would we ever stop making things better?
And we really can make things better. There's no law that technological progress has to stop somewhere. The fundamental laws of this world don't seem to forbid us from living forever. All we have to do is figure out how to do it.
Some of us are doing that, and we would like to support that. We find that the most fitting piece of social technology for that is a Mastermind group. There will be a regular meetup, and in this meetup we will exchange ideas and support each other in our efforts to become superhuman.
Activities might include the following: - Hamming circles, which is a rationality technique where a group of people work on one person's greatest bottleneck - Bonding activities from Authentic Relating, to help form friendships between people that are working on this stuff - Presentations, by participants, on important transhumanist subjects - Anything that might help us move each other forward, both personally and professionally.