Another round of Sports WIs By Decade
1900s: The negotiations creating the NCAA
1910s: Babe Ruth being shifted off the pitcher's mound.
1920s: The Survival or Failure of small town NFL Franchises
1930s: Babe Ruth's drinking, Jesse Owen at the WAA Championship Meet
1940s: Early Expansion of the NCAA Men's Basketball Tournament
1950s: Harlem Globetrotters Join the NBA, the UK NIT scandal either doesn't happen, or results in multi-year sanctions
1960s: The NFL/AFL conflict.
1970s: Bigger expansion of the NCAA Division I Men's Basketball Tournament. New York Knicks stay healthy into the late 70s.
1980s: 1984 NCAA Division I Men's Basketball Tournament and subsequent NBA Draft
1990s: 1993 Duke-UK Game, Super Bowl XXXII. the Baseball Strike.
2000s: Contraversy in the wake of the 2003-2008 (Minus 2006) BCS Picture forcing a playoff. The Commissioner Calls the Big Ten's Baseball Bluff. Hurricane Katrina.
Another one you can do along that early expansion of the NCAA one in the 40's is to have the creator of the NCAA Basketball tourney sell the idea of a football tourney, and how it would be better than the bowls.