Poking urbane fun at just about everything; R.S.V.P. Musical revue composed and written by Rick Crom. Directed by Word Baker and Rod Roger.

Translated literally, R.S.V.P. asks: Respond if it pleases you. Judged by their laughter and applause, the first-nighters at Theater East were pleased and delighted with a new intimate revue called ''R.S.V.P.'' They responded accordingly.

Three men and two women - young, nimble, attractive, talented - handle the songs and sketch material created by Rick Crom. Separately and together they poke urbane fun at such familiar phenomena as child recitalists, class reunions, and the Guardian Angels. They also satirize the Moral Majority, sexual mores, and hostile critics.

Mr. Crom drops names and eschews politics. His sleek and sophisticated worl-dlings inhabit the affluent white America of couture and perfume commercials. The tone is generally upbeat and inoffensive. Less blandness and more bite wouldn't hurt his jesting.

''R.S.V.P.'' goes misty-eyed now and then, as with the gently melodic ''A Quiet Kind of Love,'' sung for its tendressem by Lianne Johnson and John Wyatt. Miss Johnson sounds a more rueful note in ''It's Happening.'' Julie Sheppard gives the required edge to a couple of sardonic numbers. Of the remaining performers, Christopher Durham does nicely with ''Back Home,'' while John Fucillo sings ''I Don't Mind Being Funny'' with philosophic resignation. The company also includes an articulate pianist-arranger, Glen Kelly. Besides accompanying his fellow artistes, Mr. Kelly proves to be a wry comic in his own right.

Interior designer Carleton Varney, making his theatrical debut, has handicapped the cast with a clutter of chic furniture (including a baby grand piano). The appointments turn the postage-stamp, semi-arena stage into a miniature obstacle course. The performers cope gamely, thanks to their own adroitness and the once-over-lightly staging by Word Baker and Rod Rogers. The uncredited lighting is as theatrical as anything in a Fifth Avenue store window. Jerry Hart's costumes for the young urbanites are all very Bloomingdale's.

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