It was enough of a concern before the most contagious virus resurfaced (measles) that researchers have been looking at sporting events as mass vector events for years.

"The Federal Emergency Management Agency (FEMA) via DHS provided $625 million in grant funding to the 11 U.S. cities in hosting states to enhance security and preparedness efforts for the “safe execution” of tournament events"

https://www.cambridge.org/core/journals/antimicrobial-stewar...