Playwright Douglas Carter Beane opens up his theatrical home aka the Drama Dept. for a Judy Garland Christmas Special-styled holiday show Dec. 16 at the Greenwich House Theatre. Among the celebrities expected to drop in for the festivities are Judy Kuhn, Marc Kudish, Jackie Hoffman, Dylan Baker, Isaac Mizrahi, Mary Beth Peil and Caroline Rhea. Tickets are $35 or $75 with a party in Beane's actual living room after the show. The Greenwich House Theatre is located at 27 Barrow Street off Seventh Avenue South. For reservations, call (212) 633-9632. The Drama Dept. is on the web at http://www.dramadept.org