Treasurefest on Treasure Island - San Francisco, CA is a monthly celebration of all things local and unique to the Bay Area. It takes place the last weekend of each month February through November. We have been coming to Treasurefest since it was called The Treasure Island Flea Market (a long damn time). It is an awesome event and always promises to have plants. Several vendors from all over California come to the market and we have scored some great stuff over the years.