Society of Three Speeds!
There are rules and such, but they are non-onerous if you are fan of three speed bikes:
I heartily recommend joining for the attractive membership package including pins and frame stickers, as well as for the general support of three speed style bicycling. Memberships appear to be currently discounted, so join quick if you are soinclined. If you happen to live in Portland, Shawn organizes many a three speed ride. More info on the Society of Three Speeds website, Shawn also blogs at Urban Adventure League which gets the Moscaline seal of approval.
Part of the reason I started the Tarik Saleh Bike Club was so I could have something to trade with other bike clubs. So let me know if you want to trade some TSBC pins for your bike club stuff. We are truly living in the golden age of bicycle clubs.