Old Greenwich’s P.J. Morello returns to the stage in The Fantasticks, the world’s longest-running musical; 8p.m., Friday and Saturday, July 25 and 26, Aug. 1, 2, 8, and 9; 2:30 p.m., Sundays, July 27 and Aug. 3; Powerhouse in Waveny Park; $25 for adults and $20 for students and seniors; 966-7371; Tpnc.org.