The NFL Draft appears set, but everything else is highly tentative with most of the dates coming from the leagues themselves, so take that for what it is (i.e., FAR from official):
UFC | April 18 | Estimate |
NFL Draft | April 23-25 | Likely Set |
Premier League | May 1 | Estimate |
Serie A | May 3 | Estimate |
NASCAR | May 9 | Estimate |
MLS | May 10 | Estimate |
LPGA | May 14 | Estimate |
WNBA | May 15 | No Date Change Yet |
PGA Tour | May 21 | Estimate |
AFL (Aussie Rules) | May 31 | Estimate |
ATP & WTA | June 8 | Estimate |
Formula 1 | June 14 | Estimate |
NBA | June 14 | Estimate |
NHL | June 15 | Estimate |
MLB Opening Day | June 16 | Estimate |
U.S. Open (golf) | June 17-20 | No Date Change Yet |
Wimbledon | June 29-July 12 | No Date Change Yet |
British Open | July 16-19 | No Date Change Yet |
Indy 500 | Aug. 23 | Likely Set |
CFB Week 0 | Aug. 29 | Likely Set |
U.S. Open (tennis) | Aug. 31-Sept. 13 | Likely Set |
CFB Week 1 | Sept. 5 | Likely Set |
Kentucky Derby | Sept. 5 | Likely Set |
NFL Opening Game | Sept. 10 | Likely Set |
Canelo-GGG Fight | Sept. 12 | Likely Set |
NFL Opening Sunday | Sept. 13 | Likely Set |
Preakness Stakes | Sept. 19 | Estimate |
French Open | Sept. 20-Oct. 4 | Likely Set |
Ryder Cup | Sept. 25-27 | Likely Set |
Wilder-Fury III | Early October | Estimate |
Belmont Stakes | Oct. 9 | Estimate |