www.meetup.com 

www.mumsmeetup.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 9,000 groups get together in local communities each day, each one with the goal of improving themselves or their communities.  Where lonely people make friends. Be lonely no more.