HAPPENIN’ OTSEGO for THURSDAY, AUGUST 23 Beginnings Of Baseball Trading Card Game COMMUNITY PROGRAM – 6:30 p.m. Learn how the baseball card game began with Hall of Fame librarian Jim Gates in “The Origins of Trading Cards.” Woodside Hall, 1 Main St., Cooperstown. 607-547-0600, ext. 101 or visit www.facebook.com/Woodside.Hall/ PARK WALK – 6:30 – 8 p.m. Walk through norther portion of park with Patricia Riddell Kent and Steve Kent. Visit historic building, fields, forests along Schenevus creek on mostly flat terrain. Riddell…