NFL: https://www.nfl.com/schedules/

NCAA Football:

NHL: https://www.nhl.com/schedule

NBA: https://www.nba.com/schedule

MLB: https://www.mlb.com/schedule

MLS: https://www.mlssoccer.com/schedule

The USFL: https://www.theusfl.com/schedule

NASCAR: https://www.nascar.com/nascar-cup-series/2023/schedule/

2023

Rugby World Cup - France - Sept. 8 - Oct. 28: https://www.rugbyworldcup.com/2023/
Pan AM Games - Santiago Chile - Oct. 20 - Nov 5: https://www.santiago2023.org/en

2024

Olympics - Paris - July 26 - August 11, 2024: https://olympics.com/en/olympic-games/paris-2024