Benefit for animal-advocacy organizations Friends of the Animals Foundation and Feral Cat Assistance and Trapping. From the announcement in the WSB Forums, which you can read in full here:

All ages are welcome; no admission cost. There will be lots of fantastic silent auction items, purrraffle prizes, chair massages, and for the adults, a wine pull and drink specials. Come for the whole four hours or as long as you can!

Donations of wet or dry cat food are always appreciated and will gladly be accepted at the door.

FAF website/blog post: http://www.fafseattle.org/Friends_of_the_Animals_Foundation/Blog/Entries/2012/2/27_Spring_to_Their_Rescue.html
Facebook Event Posting: https://www.facebook.com/events/382463085099782/
Register for this event: http://events.constantcontact.com/register/event?llr=wcp4upcab&oeidk=a07e5paf3njcfdc2439