Bay seniors interested in being on the tip of the edge of the rim of contemporary art know that the Art Miami Fair is the epicenter of all that is new. What you may not know is that it will be playing in San Mateo this coming weekend. In a shameless effort to get digital billionaires to dig into their khakis and buy art, 75 blue chip galleries from 42 countries will be presenting the works of over 750 artists. Seniors $15. Prepare to be staggered, awed, annoyed and overwhelmed.