The PantheaCon is a pagan-oriented convention, sponsored and presented by Ancient Ways, a metaphysical store based in Oakland, California. It is the only event of its kind on the West Coast, and takes place for four days over Presidents Day weekend in February. You often have overlap with Valentine's Day and Carnival too, so there is plenty of time and lots of good energy.
A large variety of workshops, classes, lectures, gatherings and rituals take place all over the convention venue, which is a Bay Area hotel. I first went to PantheaCon in 2000, and for the first two times I went the con was in San Francisco. For the 2002 event, it was held in San Jose. Sadly, I have no pictures at all from the first year I attended.