Things have changed...idk about the oldies all day concert at Phillips but this summer it's mainly like sugarland, Britney spears, Taylor swift, etc.
screen on the green is awesome. I'm going next week to watch sixteen candles with some girlfriends. as long as there's not too many teenagers there, it stay pretty calm although there were problems w/"rowdiness" in the crowd last summer.
some of the best concerts at chastain this summer include frampton, hall & oates, and steely dan.
as far as i know, the Atlanta arts festival is still going on, but that's not until the very end of summer i think. also the jazz festival was a few weekends ago and i heard good things about that. there have actually been quite a few free festivals around downtown lately.