A $25 PASS OPENS DOOR TO 15 EAST SIDE EVENTS
THE Upper East Side is hardly known as a theater district. Yet it contains a surprising number of theaters, surprising even to the theaters themselves. Many of them have been East Siders for nearly a decade or more. But few are close neighbors. Many are tucked away on residential streets. And all have heard audience members say: ''You know, I live just a few blocks away and I didn't know until now that you were here.'' So now, nine of the houses have banded together, as the Eastside Theaters, to improve their visibility. As a curtain raiser in the campaign, they are conducting a festival (through Feb. 17) that offers a bargain in these days of astronomical ticket prices. For a $25 pass, one can visit all the theaters, choosing from more than 45 performances of 15 events including drama, a musical, comedy improvisation and operettas. That, they say, is a savings of $100. The pass is available at all the theaters. Tickets for individual shows range from $8 to $18.