Want to catch the fading notes of the summer art season? Just follow the music. This weekend Whitney Live and P.S.1 Warm Up close out their epic summer music series with not-to-miss parties. Meanwhile, indie-rock front man Robert Pollard of Guided by Voices puts together a show of his collages. Wax nostalgic about summer vacation at Celebrating the States: Summer Campers Take on Art at David Zwirner, or just get cynical with with Frownland at P.S.1's Greater New York Cinema. Then do something productive: catch the shows on our Not to Miss list before they're gone for good. But don't worry about falling behind, new glories lie in wait for September. Get ready for September's circuit of cocktails and benefits with MoMA's PopRally, and keep the cocktails flowing at Jen Bekman's Try Benefit Art Show.