As one who has grown up in this park it's an honor to have been involved with this event now for the past few years.
The Thurs Oct 4 gig is a benefit for the Chastain Park Conservancy (see link below).
This great party - On a Green Night - is thrown in the amphitheater yearly to raise money for improvements in the park.
Lots of local restaurants represented, silent auction, etc. That said, it's a $100 ticket!

MOJO DOJO featuring Kenny Banks, Dan Coy, Mace Hibbard, Marlon Patton and Gordon Vernick

http://www.chastainparkconservancy.org/on_a_green_night_2012.html