On Tues. July 18 at 8 p.m., the Washington Square Committee will hold a benefit at St. Mark’s Church at 10th St. and Second Ave. Performers will include The David Amram Trio, folksinger Odetta, Keir Dullea, Mia Dillon, John Ventiglia of “The Sopranos” and others. The benefit will help cover legal fees for the effort to stop the proposed renovation of the historic park. Ticket price is $20.