HAPPENIN’ OTSEGO for WEDNESDAY, JUNE 13 Tour Old Oneonta Fair Grounds WALKING TOUR – 7 p.m. Wayne Wright, of the Greater Oneonta Historical Society, leads a tour of the former grounds of the Oneonta Central Fair (1873-1926). Cost, $3. Meet corner of Belmont Place & Hudson, Oneonta. Call 607-432-0960 or visit www.oneontahistory.org AUTHORS SERIES – 1 p.m. Baseball authors Randy Roberts and Johnny Smith present and discuss their book “A Season in the Sun: The Rise of Mickey Mantle.” Followed by a…