I just got this press release:

In a joint effort to present the arts and culture to the diverse and myriad communities in Southern California, the Museum Marketing Roundtable announces the seventh annual ‘Museums Free-For-All’ Saturday-Sunday, January 28th and 29th, 2012. The museums—presenting art, cultural heritage, natural history, and science—will open their doors wide and invite visitors free of charge.*

The Annenberg Space for Photography
Autry National Center
California African American Museum
California Science Center
Chinese American Museum of Los Angeles
Fowler Museum at UCLA
The Hammer Museum
The Getty Center
The Getty Villa**
Laguna Art Museum
Los Angeles Fire Department Museum and Memorial (Hollywood and San Pedro)- (Saturday, January 28th ONLY)
The Museum of Tolerance- (Sunday, January 29, ONLY)
The Museum of Contemporary Art- (Sunday, January 28, ONLY)
Museum of Latin American Art
Pasadena Museum of California Art
Santa Monica Museum of Art- (Saturday, January 28th ONLY)
Skirball Cultural Center ***- (Saturday, January 28th ONLY)
Zimmer Children’s Museum- (Sunday, January 29th ONLY)

*Regular parking fees apply. General museum admission only. May not apply to ticketed exhibitions.
**Timed tickets are required. Visit www.getty.edu.
***Timed entry to the Noah’s Ark exhibition will be on a walk-up, first-come, first-serve basis on this date

When: Saturday, January 28th, and/or Sunday, January 29th (see exact dates per institution above)
How: Public information: www.museumsla.org