This is what I found. . .

I live in East Cobb between Marietta and Roswell. Drove past the Avenue mall this AM and there was a cool car show in progress. Turns out it is the 1st Sunday of every month and it is called “CAFFEINE & OCTANE”. The location is:
THE AVENUE EAST COBB Shopping Center
4475 ROSWELL ROAD (GA-120), EAST COBB
(JUST EAST OF JOHNSON FERRY ROAD)

SATURDAY,1st of the month
8:30 TO 11:00 AM

The show is free and there is a Panera Bread in walking distance and a Starbucks nearby.

There were lots of American classic hot rods and late model (vettes, etc), a ton of Ferraris and Porsches and motorcycles. Several Lotus, some nice Pantera's, Maserati's, etc