Find a local Buddhist meditation group. They'll have at least weekly "sittings", often more frequently. Just recently this searchable list of north american sanghas went up:

http://buddhistinsightnetwork.org/sanghas

If you are in the SF Bay Area, the Insight Meditation Center in Redwood City is the home for Gil Fronsdahl, cited above.

http://www.insightmeditationcenter.org/