The winter-solstice festival returns on Saturday. Highlights of the schedule are a reprise of Chris Herbert's Winterize (a chilly pleasure last year); a bicycle-bell piece by Merche Blasco; a new version of James Holt's Bach-on-the-G concept; a percussion procession led by TIGUE (the core of the amazing Wall Street Vexations); and, of course, a boombox opus by Phil Kline.