THURSDAY APR 22

Grab that Fly-by and have a peaceful lunch before the hordes of high schoolers descend upon Cambridge for a midday organ recital by Daniel Forger and Iris Lan. Adolphus Busch Hall, 29 Kirkland St. 495-9400. 12:15 p.m. FREE.

Paint the town. The Mainly Jazz dance company performs "In Close Quarters." Adams Pool Theatre, Adams House. Tickets available at Sanders Theatre Box Office (496-2222) and BosTix. 8 p.m. $5.

Just last year, many of the actors in this show were mere babes donning their bright Harvard sweatshirts for the first time. Now they're not quite sophomores, but this group of talented freshmen have written, produced, directed and are now performing in a musical they'd love you to see. Their version of the Hong Kong opens today. Agassiz Theatre, Radcliffe Yard, 10 Garden St. 496-2222. 8 p.m. $5.

Balance or bandwagon? It's not just an international relations theory of alliance systems anymore. Only graduate students would enjoy that joke, so hang out with them for some cinematic fun. Stay and really "make 'em laugh" during Singin' in the Rain. Graduate Student Lounge, Lehman Hall, Harvard Yard. The Bandwagon at 6 p.m.; Singin' in the Rain at 8 p.m. FREE.

Gently, Like Cracking Stones author Tim Mason runs the show at another afternoon installment of the Holyoke Center Spring Poetry Series. Other poets also gather to share their lyric phrasing. Forbes Plaza, Holyoke Center. Noon. FREE.

There's more to movies than Matt Damon. Marlon Brando, for example. Check out On the Waterfront, the hard-hitting story of a longshoreman and ex-prize fighter facing corrupt labor leaders. South Boston Library, 646 E. Broadway. 268-0180. 6 p.m. FREE.

So you think you've heard every big group known to man? You've been around the concert circuit and you've seen them all? Bet you haven't seen Russia's number one folk/rock group, Inna and the Farlanders, led by vocalist Inna Zhelannaya. Influenced by traditional tunes and jazz, the Russian quintet rarely plays the U. S. Johnny D's, 17 Holland St., Somerville. 776-7450. $7.

Check out one of the nation's premier dance troupes as Judith Jamison leads the Alvin Ailey American Dance Theater Ensemble. Through Sunday. Wang Theater, 270 Tremont St. 482-6661. $20-$55.