Woolly Mammoth celebrated its fifth anniversary with a benefit party last weekend. In keeping with its current production, "Through the Looking Glass," it cajoled Renee Poussaint, Arch Campbell, Patrick Hayes and a few others into wearing "Alice in Wonderland" costumes. It hopes to clear $10,000 . . .

"Vampires in Kodachrome," a new play by Dick Beebe, the third in Arena's play lab series, will be read Sunday at 2 p.m. Members of the company will give it a stage reading, followed by a discussion with the author. The play is set at the end of World War II, but has something to do with the ancient Transylvanian myth . . .

The 17th American College Theatre Festival starts April 15 at the Terrace Theater. Six productions are finalists, including two original plays -- "Excursion Fare" by Dennis Smith of the University of Oregon, and "Bruinhaha" by the company from UCLA. Virginia Polytechnic's production of "How I Got That Story," the University of Tulsa's "What I Did Last Summer," the University of Richmond's "Hiawatha" and California State's "Sweeney Todd" are the other finalists . . .

The French Embassy is opening its own theater -- a 285-seat hall complete with lighting equipment. Source Theatre will inaugurate it with a production of "The Bald Soprano" on April 3 . . . The Dance Exchange is presenting a discussion of "The Political Statement: The Challenge for New Forms" for theater and dance artists on March 29. Call 232-0833 . . .

A small part in "42nd Street" at the National Theatre is being played by Lew Resseguie, who used to run dinner theaters and an advertising agency here. He gave it all up in 1977 to go to New York and seek his fortune as an actor, getting his first role 18 months later in the Angela Lansbury production of "Gypsy." Coincidentally, he was once directed in an American Light Opera Company production by Donn Murphy, who is now president of the National . . .