HAPPENIN’ OTSEGO for SUNDAY, JAN. 21 Presenting Student Entrepreneurs MARKETPLACE – 1 – 3 p.m. CCS Students hold a TREP$ Marketplace to show the businesses they have created. Come out to shop and support tomorrows entrepreneurs. Gymnasium, Cooperstown High School. Call 607-547-8181 or visit www.cooperstowncs.org POP CONCERT – 2 p.m. The Catskill Valley Wind Ensemble present the Mid-Winter Concert featuring tunes from the 20s, a medley from “West Side Story,” themes from James Bond, and more. The First United Methodist Church, 66…