The MassMutual Center is a multi-purpose arena and convention center complex located in downtown Springfield, Massachusetts, United States, in the city's Metro Center. The arena opened in 1972 and the convention center opened in 2005. It serves as a venue for meetings, conventions, exhibitions, sporting and entertainment events.

Springfield is the most populous city in and the seat of Hampden County, Massachusetts, United States. Springfield sits on the eastern bank of the Connecticut River near its confluence with three rivers: the western Westfield River, the eastern Chicopee River, and the eastern Mill River. At the 2020 census, the city's population was 155,929, making it the 3rd most populous city in the U.S. state of Massachusetts and the 4th most populous city in New England after Boston, Worcester, and Providence. Metropolitan Springfield, as one of two metropolitan areas in Massachusetts, had a population of 699,162 in 2020.