Monday Mash – Meet at Atlanta Bicycle Barn, roll out around 7:30pm.
Dirty Mustache – They meet up Tuesdays at the Flying Biscuit on McLendon @ 8:30pm
WNJACS – Meet at Atlanta Bicycle Barn on Wednesdays, roll out around 8:30pm.
#fmrideATL – Meet at Atlanta Bicycle Barn on Thursdays, roll out @ 6:45pm sharp.
Southeastern Cycling has a list of local group rides sorted by weekday.