Teresa Rebeck, Horton Foote, Shel Silverstein, Leslie Ayvazian and Lawrence Luckinbill are among the playwrights featured in the Ensemble Studio Theatre's annual Octoberfest, which gets underway Oct. 2.

The month-long event will include staged reading and full productions of both old and new plays, on EST's two stages. Admission is free but reservations are required.

Octoberfest kicks off with a production of Teresa Rebeck's Drinking Problem , part of a double bill with Tim Gallagher's The One the Wolves Pulled Down. The evening plays Oct. 2 at 7 PM and Oct. 3 at 2 PM. Also on Oct. 3, at 7 PM, is Paul Zindel's Every Seventeen Minutes the Crowd Goes Crazy!, which will also be done on Oct. 4 at 2 PM.

Actor Lawrence Luckinbill will star in his own one-man play Clarence Darrow on Oct. 11 and 12 at 8:30 PM. Luckinbill will play the famous lawyer.

Also slated for production or reading in Octoberfest are Shel Silverstein's A Japanese Doll or The Lifeboat Is Sinking, Horton Foote's The Man Who Climbed the Pecan Trees, and a new work, to be announced, by Leslie Ayvazian. All performances will take place at EST's space at 549 W. 52nd St. In Manhattan. For information, call (212) 247-4982.

--By Robert Simonson