[Subject to possible pre-emption, of course] On ABC "Nightline" on Friday, June 3: the story of Boris and Bessie Thomashefsky, Yiddish theater, and Michael Tilson Thomas's musical theater tribute to his grandparents, "The Thomashefskys: Music and Memories of a Life in the Yiddish Theater." Filming for the segment took place in and around the world premiere of "The Thomashefskys" in New York in April. "Nightline" is on Channel 7 in the Bay Area, at 11:35 p.m. The MTT-SFS performance of the show is scheduled in Davies Hall on June 29. That show is sold out, but an open rehearsal has been added, 10 a.m. to 1 p.m. on 6/29. Janos Gereben/SF www.sfcv.org [log in to unmask]