There is much to cheer about Bergamot Station on the occasion of its birthday. In its "before" phase, the 6.5-acre complex of art galleries was simply a dead-end street in an abandoned Santa Monica trolley stop. Today, it is an open, gritty-chic complex of 37 galleries housed in 10 corrugated metal buildings scattered around a large parking lot, plus the Santa Monica Museum of Art, three architecture firms, a custom frame shop and the Gallery Cafe. The parking lot usually can accommodate the day's traffic, even a typical Saturday influx, but be forewarned: There is no way it can handle anything close to the thousands of cars expected this Sunday afternoon. Be prepared to park elsewhere and walk or taken the free shuttle bus from 26th and Cloverfield.