It’s been a good summer. For DCist it has, anyway, filled with cheetah cubs and buttersticks, Nats games and Borf sightings, and lots of sweaty, booze-soaked cookouts. But fall is coming, people, and it’s time to put the flip-flops aside, say goodbye to the interns, and fill out your autumn dance card. DCist humbly offers the following suggestions. Oh, they grow up so fast. One day they’re lil, playing hoops and making MTV videos, the…