What is the Indy 500-NASCAR double? How Katherine Legge can join Tony Stewart, Kurt Busch with rare feat

Katherine Legge is attempting the rare Indy 500-NASCAR double on Memorial Day Weekend 2026, a feat that would make her the first woman ever to start both races on the same day. Only one driver has ever completed the full double, while Kyle Larson's most recent attempts were thwarted by weather in 2024 and crashes in 2025. Legge aims to join a short list of drivers, including Tony Stewart and the late Kurt Busch, who have attempted this challenge.