Meetup is the world's largest network of self-organized clubs and community groups. Here is the Ukulele Meetup page.
Meetup helps people:
Flea Market Music's Player Directory ( www.fleamarketmusic.com/directory/default.asp )
Flea Market Music's Player Directory allows you to add yourself to the growing list of ukers in the search of fellow strummers. You can search for players by screen name, U.S. Players by state, International Players by country, start a local Player Group or find a group near you and join in the fun.