Stadium 1 at the BNP Paribas Open is the second largest tennis-specific stadium in the world, with a capacity of more than 16,000. The tournament is usually held in March and is the first ATP Masters 1000 event of the season, but due to the Covid-19 pandemic, it takes place in October in 2021.
https://www.atptour.com/en/news/indian-wells-2021-atp-masters-1000-history-draw-schedule

