ONGOING until May 11 is Gantimpala Theater’s 2013 Summer Musical Theater Workshop for teens and young adults. Gantimpala is a 36-year-old dramatic arts company with a theater season of the Four Classics such as “Florante at Laura,” “Kanser (Noli Me Tangere),” “Ibong Adarna” and “El Filibusterismo”; also the historical drama “Katipunan: Mga Anak ng Bayan” and the children’s Filipino musical “Ang Prinsepe at ang Pulubi.”