When your showbiz career hits the skids, well, you gotta look for other income. Maybe that’s why Susan Olsen (you knew her as cherubic Cindy Brady on The Brady Bunch) was in Somerville on Saturday, selling her “Fluff-inspired” artwork at the What the Fluff? Festival. According to her bio on the festival’s website, she’s “long been inspired by Marshmallow Fluff.” Danny Bonaduce, take note. [Inside Track]