Reviews by Leah Ollman (L.O.). Openings Milton Davis and Vickie Uyeda: Common Ground Exhibition pairs the drawings and paintings of the two veteran L.A.-based artists. The Main Museum, 114 W 4th St., L.A. Opens Sun.; ends Sept. 2. Closed Mon.-Tue. Free. (213) 986-8500. John Gerrard: Solar Reserve...