Ceremonies in Dark Old Men is by Lonne Elder IV, an up-and-coming black playwright from New York City, and you can find a review on page two, I believe. 7:30 at the Loeb Ex.

Changes consists of "a variety of original improvisations" and three one-act plays, one of which is apparently a jam session by local jazzmen. The other two are The Jewish Wife, which I gather is one of Bertolt Brecht's less worthwhile plays, and Michael McClure's The Cherub, which is evidently about someone called The Bed and described only as a sixty-two-year-old actress who must be seen. I have little or no idea what this means. Thursdays (cheaper), Fridays and Saturdays, 8 p.m. at Theater Two, 196 Broadway near Kendall Square.

In the Jungle of Cities is also one of Brecht's less worthwhile plays. Its chief value probably lies in its encouragement to young playwrights who feel awed by Brecht's maturity. A sort of Two Gentlemen of Verona for Marxists, or something. 369, a new Cambridge company, gives it a better production than it deserves. A pan that is probably too kind probably appears on page two. 369 Center, off Washington Street near Union Square.

The Rivals, by Richard Brinsley Sheridan, is the play that introduced Mrs. Malaprop and herisms to the world. It's getting a Mainstage production with a professional director, Norman Ayrton, so chances are that it should be good, I guess. The play itself is simply eleemosynary. Opens tonight at 8 at the Loeb.

The Paper Waste is the Law School Drama Society's "new musical comedy about a faded Hollywood studio's efforts to film the 'ultimate' expose of life at law school. "Any resemblance to real studios living or dead is presumably coincidental. This weekend, 8 p.m. in the Pound Building at the Law School.