Sherlock Junior, a 1924 Buster Keaton comedy, is being shown tonight as part of the Museum of Fine Art's summer-long tribute to the great stone face. Of all the comic stars of the silent screen, Keaton was the funniest, the most sensitive, the most intelligent. He is, above all, too good to lose, and the MFA deserves praise for resurrecting his genius. Tonight's film is about "a humble movie projectionist who is transformed into a master detective thanks to the magic of the silver screen." It's showing with Keaton's The Paleface. With great movies like these playing for free at a neat place like the MFA's outdoor Sculpture Court, there's no reason in the world to sit home and be bored tonight. The show starts at sundown.

The Summer Dance Film Series, which begins tonight at Agassiz House, is another special treat for local moviegoers, especially ones who have any sort of interest in classical ballet. This evening's showing is a triple feature, high-lighted by a film-record of Nijinsky performing "Afternoon of a Faun;" simply incomparable. Movies of ballet tend to get a little boring and admittedly nothing can match the excitement of an original performance, but like Keaton, performers of Nijinsky's brilliance are too good to lose to passing time. Admission to the three films, which begin at 8, is 50 cents.

Coming to Town... Several really good movies are making their way into Cambridge on Wednesday, and if you're not out fomenting revolutionary struggle or fighting imperialism--which you should be if you know what's good for you--you might as well see some of them before the weekend rush. The most exciting movie event in the area is tomorrow's N.E. premier of Chabrol's Wedding in Blood at the Harvard Sq. Theater. Geoff Garin's review, wildly complementary, appears on page two. Wedding is playing with The Touch, Bergman's first English-language film and his worst movie. Another great double feetch at the Brattle: A lovely movie version of Lawrence's Women in Love coupled with tte chilling Sunday, Bloody Sunday. The Welles is dragging back The Godfather, for those of you that missed it. Offa wit you head, horsey!