Natalia Makarova will be dancing in "On Your Toes" when it opens on Broadway this Sunday. Christine Andreas has replaced Regina O'Malley as the ingenue, but the cast is otherwise the same. The show has reportedly been tightened a bit, and the Seattle reviewers liked it, at any rate . . . The run of "Play and Other Plays" by The Acting Co., due to start tomorrow, has been canceled to extend the run of their "Pericles," which will play through the week at the Terrace Theater . . .

The Washington Projects for the Arts and the New York-based Collaborative Projects Inc. are sponsoring a month-long "art event" that starts March 26. Performers are invited to include themselves--plans are to schedule three evenings a week for performances, with Washington folks alternating with New York visitors. The event will be held in the old Ritz Hotel, a one-time rooming house on F Street that is about to undergo renovation. Artists of all kinds are invited to an organizing meeting tomorrow at 7 p.m. at the WPA. Call 347-8304 . . .

Harry Bagdasian, artistic director of the New Playwrights' Theatre, barely made it through the recent Richard L. Coe Awards before going to the hospital with his wife, Robbie, to await the birth of Katherine Alexandra Bagdasian. She arrived at 7:30 a.m. Feb. 21--right on schedule. Harry missed the postawards party at the British Embassy, which--given the crowd that made it almost impenetrable--was no great tragedy . . .