ROCHESTER HILLS -- The lyric of the Stills Young Band's "Long May You Run" -- "we find things to do in stormy weather" -- was seldom more appropriate than during Stephen Stills and Judy Collins's concert on Saturday night, June 9, at the Meadow Brook Amphitheatre. The show, celebrating the 50th anniversary of the two artists' meeting -- and a subsequent romantic relationship that inspired Crosby, Stills & Nash's indelible "Suite: Judy Blue Eyes" -- was dampened, and then some, by constant rain, including a deluge that hit early in the show.