Here is the release, from the track's website:
"Management for Jukasa Motor Speedway has made the difficult decision to cancel the 2021 season, due to the ongoing COVID-19 Pandemic.
With the uncertainty of international border crossing for competitors and fans, unknown allowances for on-site fan support, and the evolving and costly safety protocols, the decision to cancel the season was made at this time to ensure competitors, fans, and staff.
Those who purchased reserved seats, general admission tickets and campsites for the 2020 season that were postponed to 2021 will be automatically refunded their purchases, minus service fees. For further inquiries, please contact us."