Bay Street Theater Virtual Gala Bay Street Theater Virtual Gala.BAY STREET THEATER is a not-for-profit 299-seat professional regional theater situated on the Long Wharf, in Sag Harbor, NY, and was founded in 1991. Founded by Sybil Christopher, Emma Walton Hamilton and Stephen Hamilton. SUPPORT THIS CHARITY’S STORYBAY STREET THEATERNONPROFIT CREDENTIALI.R.S. EIN 13-3628854 December 2, 2020 Theater | Opera | Symphony, Staff Favorites, Star Sighting! Star Sighting!