Just FYI, the museum is free, but parking is 8 or 10 bucks. The parking fee is per car, so includes as many people as you can cram into one vehicle. So, if you all will be meeting up there, and it is convenient for you, you might be able to save some dough and some traffic congestion by meeting off site and carpooling to the lot. Don't bother trying to find parking right next to the Center, as there is not any. Meet somewhere down near Sunset Blvd. instead.
...and while you are in the neighborhood, you can stop in to Bel-Air Camera.
If you want to check out some fine art photo galleries, there are a handful in one location at Bergamot Station in Santa Monica:
Craig Krull Gallery
Bergamot Station 2525 Michigan Ave Bldg B-3, Santa Monica, CA 90404
310 828-6410
Gallery Luisotti
Bergamot Station 2525 Michigan Ave A2, Santa Monica, CA 90404
310 453-0043
Peter Fetterman Gallery
19th and 20th century photography.
Bergamot Station 2525 Michigan Ave Gallery A7, Santa Monica, CA 90404
310 453-6463
Rose Gallery
Bergamot Station Arts Center 2525 Michigan Ave Bldg G-5, Santa Monica, CA 90404
310 264-8440
Fairly close to the Getty, there are also:
Gagosian Gallery
456 N Camden Dr, Beverly Hills, CA 90210
310 271-9400
Apex Fine Art
20th Century photography. Open Tuesday thru Saturday 11 a.m. to 5 p.m.
152 N La Brea Ave, Los Angeles, CA 90036
323 634-7887
Fahey/Klein Gallery
Open 10 a.m. to 6 p.m. Tuesday through Saturday.
148 N La Brea Ave, Los Angeles, CA 90036
323 934-2250
G. Ray Hawkins Gallery
300 N. Crescent Heights Dr, Los Angeles, CA 90048
323 655-4180
Jan Kesner Gallery Est. 1987
Open Tuesday thru Saturday 11 a.m. to 5 p.m.
164 N La Brea Ave, Los Angeles, CA 90036
323 938-6834
Paul Kopeikin Gallery
138 N La Brea Ave, Los Angeles, CA 90036
323 937-0765
Stephen Cohen Gallery Est. 1992
7358 Beverly Blvd, Los Angeles, CA 90036
323 937-5525
...most of which I am familiar with. It might be worth calling ahead to see what each of them will have on display when you are in town.