Weekend Picks: David Bowie, Anna Camp, Alvin Ailey and a funny ‘El Niño’

Weekend Picks for April 19-22: Complexions Contemporary Ballet, Alvin Ailey American Dance Theatre and Dance Theatre of Harlem; Will Oldham with Eighth Blackbird; de Angelis Vocal Ensemble; "Belleville" at Pasadena Playhouse; "El Niño" at Rogue Machine.