meetup.com

www.meetup.com

Meetup is the world's largest network of local groups. Meetup makes it easy for anyone to organize a local group or find one of the thousands already meeting up face-to-face. More than 2,000 groups get together in local communities each day, each one with the goal of improving themselves or their communities.

If you're looking for a group to enjoy the outdoors, ride your Harley with, or do a mommy's morning out, this is the place. Organizers post a meetup, and each member can post an attending: yes or no reply.

Check it out.