The Atlanta Baroque Orchestra has become a sponsor of the Atlanta Classical Music group at Meetup.com. This group, with over 400 members, has been active since 2008. From their group description on their page:
This group is for any music fan or musician in metro Atlanta who wants to make friends, find out about the most interesting concerts in Atlanta, and attend them. We meet for concerts featuring orchestral, choral, chamber, opera, ballet and recitals, from the largest concert halls to recital halls at colleges, to churches and coffee houses. We rely on our members to nominate concerts they’d like to attend. We meet before and or after concerts for dinner, drinks, coffee, or dessert. Join for more information about upcoming events, or to help this Meetup gain even more momentum.
The group is free for anyone to join.
Please check them out.