Hi Hannah -
The walk is sponsored by the USC Pain Center. (A very good place IMHO.) It's at 8:30 am on this coming Sunday, December 6th, at the Whittier Narrows Park. Pre-registration is required if you don't want have to show up something like an hour earlier to take care if it. Online registration closes Wednesday at 11:59 pm.
Here's the website with the info:
http://www.helpforpain.com/Race-info-09.htm
Mike