The monthly Second Saturday Art Walk is, yes, this second Saturday in St. Petersburg and it'll be especially festive as more than 20 galleries and studios get all gussied up for the holidays. The territory has become much bigger over the years from the original Waterfront and Central Arts Districts. It now includes the Warehouse District to the south and extends west to Grand Central. To make getting around easy, trolleys will roll through all of them from 5 to 9 p.m. and the ride is free. Go to stpeteartsalliance.org for a list of participating organizations and a map.