Atlantic Station hosts the Atlanta Beer Carnival each year, with beer samples, DJs, carnival games and food from local restaurants all part of the fun.
The closest MARTA station is the Arts Center MARTA Station on the red/gold rail line. It is about a 15 minute walk (take the West Peachtree Street exit out of the station and turn right, then left on 17th Street), or you can take the free Atlantic Station shuttle than runs every 15-30 minutes. Follow the signs to the buses/15th Street exit to pick up the shuttle in the bus bay (signage marks the drop off/pick up location). Bus 37 departs the station and also goes to the event.
If you wish to park and ride, the Lindbergh Center MARTA station offers the closest parking. Take a parking ticket when you enter one of the parking garages and keep it with you. On your return MARTA trip, validate the ticket in the MARTA station (look for yellow machines with flashing yellow lights) to get your free parking fare.