You can always check
www.marrow.org for upcoming bone marrow drives.
I don't know where in the Bay Area you and your donors are right now,
but I looked up upcoming drives from my zipcode here (http://
www.marrow.org/JOIN/Join_in_Person/donor_drive_search.pl?zip=94566&dist=50&x=&y=)
and here are two in the next few weeks:
Donor Center: National Marrow Donor Program Northern California &
Northwest District
Drive Name: (TB) Mission
Drive Location: Mission College
Address: 3000 Mission College
Santa Clara , CA 95054
Drive Date: Nov 4 2009
Drive Time: 11:00AM - 5:00PM
National Marrow Donor Program Northern California & Northwest District
Telephone Number:
510-292-7114
Drive Name: (tb)Rivals For Life Stanford
Drive Location: Arrillaga Center
Address: Center For Sports And Rec 341 Galvez
Stanford , CA 94305
Drive Date: Nov 17 2009
Drive Time: 11:00AM - 7:00PM
I'm not volunteering at either of these, so I can't give you more info
yet, sorry.