FRIDAY:

>> You just can’t say the D.C. music scene doesn’t care. Check out the 2-night Katrina’s Piano Fund benefit concert at Black Cat, featuring a packed line-up of local acts. Friday’s got Monopoli, the Routineers, the Washington Social Club, the Ambitions, Andy Zipf, and DJ Will Eastman. Saturday is Wooly Mammoth, The Whips, Owls and Crows, Edie Sedgwick, Rose, andDJ lil’ e. $12 for one show, or maximize your band-to-dollar ratio and pay just $20 for both nights, starting at 9:30 p.m.

>> In case you needed further evidence at what a raw deal feudalism really was, check out a new 35 mm print of Masaki Kobayashi’s 1967 classic Samurai Rebellion . The story is sort of Braveheart meets Zatoichi, with a cruel overlord meddling in a marriage between two of his subjects, and of course, awesome sword fighting. 9:40 p.m., plus Sat. and Sun. screenings. At the AFI Silver Theatre.

SATURDAY:

>> Carnegie Mellon French professor Barbara Freed created a stirring documentary in 2003 about the relationship between Henri Matisse and Monique Bourgeois (now Dominican nun Sister Jacques-Marie), and their collaboration on the Chapelle du Rosaire in Vence, France (pictured above). This film has everything: scandal, beautiful art, and nuns. A Model for Matisse screens at the National Gallery of Art’s East Building Auditorium at 2 p.m., for free.

>> The 25th anniversary party for Rob Bamberger’s Hot Jazz Saturday Night is doubling as a WAMU fundraiser, so you’ll have to fork over $100 to Lindy Hop with Kojo Nnamdi — and obviously, it would be worth every penny, especially if you also got the chance to shake a tail feather with Diane Rehm. At the Clarendon Ballroom, 8 p.m.

SUNDAY:

>> This could very well be the last nice weather weekend we’ll have for some time. Allow us to introduce you to Local Hikes, a wealth of information and tips about trails in and around the metro area. Get outside, people. Winter’s a comin’.

>> Tom Vek and Mobius Band will share their rough around the edges but synth pop sweet on the inside confections with the rest of the class on the Backstage at Black Cat. $8, 9 p.m.

>> Do you know which Star Trek films were actually the good ones? The annoucement for The Geek Comedy Tour 3000, part 2 at the Comedy Spot in Arlington also includes the tagline: “Comedy that KNOWS Han shot first.” If you get this reference, get yourself to the free stand-up show from 8 to 10 p.m. and revel in your geekdom. Also, ladies, if you like your boyfriends a little on the nerdy side (and who doesn’t?), this may well be the greatest pick-up spot to find single men in the history of the world.