Thu., April 10-Sat., April 12 - "A Little Night Yiddish: A Revue of Yiddish Theatre & Song." (Harvard Hillel) Beren Hall, Harvard Hillel, 52 Mt. Auburn St., Thursday at 8 p.m.; Friday at 3:30 p.m.; and Saturday at 9 p.m. Tickets are $15 general; $10 Harvard community; $7 students; other discounts available. Harvard Box Office (617) 496-2222.