INDIANAPOLIS (AP) — Reserved seating for this year’s Indianapolis 500, the world’s largest single-day sporting event, will be sold out, officials announced Tuesday.

Official attendance figures for “The Greatest Spectacle in Racing” are not announced, but there are an estimated 275,000 grandstand seats around the 2.5-mile oval and the total crowd, which includes general admission tickets on the infield, reaches an estimated 350,000.

Four-time IndyCar champion Alex Palou is the defending race winner and posted the fastest speed in Tuesday’s first practice session.

Race organizers said they believed the final reserved seats for the May 24 race would be sold later Tuesday, marking the second straight year and the third time since 2016 that the grandstands will be full. All badges and passes providing access to pit lane and Gasoline Alley also are sold out.

General admission tickets and a limited number of hospitality tickets are still available and race organizers said reserved seats can still be purchase on the Indianapolis Motor Speedway’s official resale marketplace through 4 p.m. on May 20.