IF THE NEW YEAR’S FESTIVITIES ARE OVER, THE CHAMPAGNE IS FLAT and the chill has set in, then it must be time for Out There, the Walker Art Center’s twenty-three-year old January festival of the emerging, the risky, and bizarre in performance. The name’s always amused me. I picture a committee spinning their pencils, debating the merits of Weeks of Wackiness and Weird!! before settling on Out There…