While fans ticketed within 15 feet of the courtside area will still need to comply with NBA entry requirements, fans throughout the rest of the arena will no longer need to provide proof of a negative COVID-19 test or full vaccination. The building’s mask mandate will remain in effect for fans age two & up regardless of vaccination status, except when actively eating or drinking.

https://www.dallasnews.com/sports/mavericks/2021/10/24/mavs-to-lift-covid-19-vaccine-testing-requirement-for-fans-as-long-as-dallas-county-data-complies/