Olney Theatre reports that this summer was its most profitable season ever and has scheduled a preseason rerun of "Do Patent Leather Shoes Really Reflect Up?" for next May . . . The West End Dinner Theatre has become an Actor's Equity theater.

The Kennedy Center's deadline for applying to audition for the Holiday Festival is this Friday. Jugglers, musicians, clowns, mimes, puppeteers, etc., should apply in writing to Tracy Wilson at the Center (zip 20566). Include a self-addressed, stamped envelope if you want re'sume' materials returned.

The Playwrights' Unit, now entering its third year, has expanded operations to include readings and workshops at three additional small theaters. Originally affiliated with the New Playwrights' Theatre, the group of 15 area writers will be working with Horizons, Source and Woolly Mammoth as well as presenting Monday night readings at NPT. Ernest Joselovitz notes that eight of the members have had works produced or scheduled for production this year, including Stephen Hayes' "The Shady Side" at Source and his own "There is No John Garfield" at the American Line Theatre in New York. Writers interested in joining the group should send bios and scripts to Joselovitz at NPT, 1742 Church St. NW, 20036. Although the group currently has no openings, qualified applicants will be placed on a waiting list.

The D.C. Community Humanities Council has given a grant to Horizons Theatre for a "humanistic" expert to lead discussions after Friday night performances of "Sign of Life." Anne Romines, an instructor at George Washington University in late 19th-century American literature, is the lucky humanist.