Overview
- Kyle Busch died Thursday after severe pneumonia progressed to sepsis, a loss that cast a somber tone over the Memorial Day weekend and prompted tributes across the garage.
- Persistent rain and heavy fog on Saturday forced NASCAR to cancel Cup qualifying and set the Coca‑Cola 600 grid by the rule book, putting points leader Tyler Reddick on the pole.
- The O’Reilly Auto Parts Series Charbroil 300 was delayed more than four hours and declared official after Stage 2 with Ross Chastain named the winner because visibility and oil on the track prevented a safe restart.
- The Craftsman Truck Series event was postponed repeatedly and run as a time‑constrained race on Sunday morning, which Layne Riggs won after multiple cautions and wrecks.
- At Symmons Plains in Tasmania, Chaz Mostert and Andre Heimgartner posted strong results but Mostert received a 15‑second penalty for contact and Brodie Kostecki is under investigation for an alleged impeding incident, leaving disciplinary outcomes still pending.