Besides the Indy 500, Marco Andretti will race in the new Superstar Racing Experience (SRX) Series per this tweet announcement below.
“I am extremely excited to join the SRX series,” Andretti said. “I look forward to racing against some of the legends of auto racing across different series. I am especially excited to go head-to-head with my friend Tony Stewart.”
— Superstar Racing Experience (@SRXracing) February 3, 2021