To do:
http://events.hackerdojo.com/
http://www.baythreat.org/

ACCU  http://www.accu-usa.org/
Bay Area Debian  http://bad.debian.net/
BAFUG S.F.  http://www.bafug.org/
BALUG  http://www.balug.org/
[ BAWUG  http://www.bawug.org/ ]
BayPIGgies  http://www.baypiggies.net/ 
BayLISA  http://www.baylisa.org/
BerkeleyLUG http://www.berkeleylug.com/
BUUG  http://www.buug.org/
CABAL  http://linuxmafia.com/cabal/
[ CalLUG http://www.ocf.berkeley.edu/~linux/
    http://callug.cs.berkeley.edu/ ]
CCSF LUG mailing  http://hills.ccsf.edu/~pbuddebe/lug/
    http://www.ccsf.cc.ca.us/Organizations/Linux_Users_Group/ 
Cocoaheads http://cocoaheads.org/us/SiliconValleyCalifornia/
[ CSUEB LUG http://csueb-lug.blogspot.com/ last activity 2008 ]
DVLUG  http://www.dvlug.org/
EBLUG  http://www.eblug.org/
Felton LUG  http://feltonlug.sturdywebs.com/
Linux Consultants' Lunch  inquired about missing mailing list, 2006-02-21.
[ Linux User Group Hayward (Linuxdojo)  http://www.linuxdojo.net/ ]
Linuxstammtisch  http://electriclichen.com/linuxbierwanderung/local/#sanfrancisco
NBLUG  http://www.nblug.org/
Noisebridge https://www.noisebridge.net/wiki/LinuxDiscussion
[ Oakland Perl Mongers  http://oakland.pm.org/ ]
PC Clubhouse Linux SIG  http://www.pcc.org/sigs/#Linux
PenLUG http://www.penlug.org/
[ SFBA NetBSD UG  http://www.imrryr.org/NetBSD/sfbanug.html ]
SF LUG http://www.sf-lug.org/
[ SF OpenBSD UG  http://www.sfobug.org/ ]
SF Perl UG  http://sf.pm.org/ 
[ SF PostgreSQL UG  http://pugs.postgresql.org/sfpug/ last activity 2009 ]
[ SVBUG  http://www.svbug.com/ ]
SVLUG  http://www.svlug.org/
[ Silicon Valley Perl UG  http://www.rf.net/~sv-pm-org/ ]
SVWUX Silicon Valley Wireless Users and Experimenters  http://www.svwux.org/
   http://www.svwux.org/pipermail/svwux/
SJSU LUG  http://lug-sjsu.org/ [ was http://slug.engr.sjsu.edu/ ]
   http://groups.google.com/group/sjslug 
Smaug  http://www.scruz.org/
Sonoma County Sysadmins (SoCoSA) http://socosa.org/
SULUG  http://sulug.stanford.edu/
[ Starship Augusta Ada  http://trek.starshine.org/  Down since 2009. ]

Linux User Group of Davis (LUGOD) http://www.lugod.org/
Linux User Group of Sacramento (SacLUG) http://www.saclug.org/


Sites of sporadic interest:
https://www.google.com/calendar/embed?src=caj9iea2ol69b7n2uqdek4ocso@group.calendar.google.com&mode=AGENDA&gsessionid=OK
Elec. Flea Mkt. 2nd Sat. at De Anza, Mar-Oct: http://www.electronicsfleamarket.com/
Hacker Dojo Events http://events.hackerdojo.com/
Intrusion Detection UG  http://idug.cryptojail.net/
Mindsource BOFs  http://www.mindsrc.com/
Linux.org events  http://www.linux.org/event/
Mozilla Conference  https://wiki.mozilla.org/DeveloperDays
Holidays, time changes!  see:  http://linuxmafia.com/bale/holidays
O'Reilly conferences, http://conferences.oreillynet.com/
Computer History Museum http://www.computerhistory.org/events/
USENIX Association  http://www.usenix.org/events/
Computers, Freedom, and Privacy  http://www.cfp.org/
IEEE Security Symposiums  http://www.ieee-security.org/
Computer Professionals for Social Responsibility  http://www.cpsr.org/ Dead?
Vintage Computer Festival  http://www.vintage.org/events.php (November?)

CA Ubuntu's List of LUGs
https://wiki.ubuntu.com/CaliforniaTeam/Projects/UserGroupContacts/Groups#SF


Dead groups:
BANG  http://www.bang.org/
Internet Developer/Technology Group  http://www.inetdevgrp.org/
LBNL LUG  http://lug.lbl.gov/
Linux Events  http://linevents.com/  (gone)
Linux Movies Group  http://www.linuxmovies.org/
SCLUG  http://linus.got.net/
sig-beer-west  http://www.extasia.org/sig-beer-west/
SlugLUG  http://sluglug.ucsc.edu/  
WebGuild http://www.webguild.org/