Tickling Media Forum Personals
The Tickling Media Forum has a personals section for the Western United States and it's a great place to start. There is a good mix of lees and lers, and you won't have to beat around the bush because everyone there knows exactly what they want.
It's a great place for M/M meetups, and male lees can sometimes find female lers, too. But if you're looking for a female lee, good luck.
FetLife Local Tickling Groups
Fetlife, the fetish social site, has a few groups that are good for a laugh. Start with Tickling Bay Area, SF East Bay Tickle Brunch, or SF Bay Foot Fetishists. These groups are predominantly male 30+, but there is some variety.
Bondage Club Meetups
While I haven't seen any events at the SF Citadel or Armory Club that are strictly about tickling, they have plenty of themed events and you'll be in the right crowd. Ask around, but don't be a creep about it, k?