THE BASKETBALL LEAGUE!
This minor league basketball circuit has a plethora of teams from coast to coast that primarily play in the spring time - many in historic and unique buildings!
Examples: below, row one: The Gold Dome in Shreveport, LA and Salem, OR Armory.
Below, row two: Lebanon IN has one of the better atmospheres in the league while the team in Shawnee, OK is owned by s federally recognized Native American Indian tribe!

Above (video) and below - Memorial Gym in Kokomo, IN - on the U.S. National Register of Historic Places

Above and below, the historic Washington Avenue Armory in Albany, NY opened in 1890!
Below right, Owensboro Sports Center in Kentucky. Row two: The Gold Dome noted above in Louisiana, and at right, out in the Oklahoma Panhandle in Enid.