The rodeo events that take place in the Coliseum are official PRCA events.
Venue is owned by, but not operated by, Taylor county;
None of the photos in their google entry show any postings.FAQS
EXPO CENTER OF TAYLOR COUNTY
Is the Expo Center of Taylor County county owned and operated?
No. We are a 501(c)3 non-profit organization who rents the 117 acre facility from Taylor County. Our employees work for the organization and are not county or city employees.
Google Maps Street View is too old (2013, 2007) to be of use (property entrance gates) as to determining posting.
I'd suspect that as long as you stay out of the coliseum during rodeo events, you're OK. Maybe some from Abilene can verify.