Westlake, Texas. Some sort of Aerial demonstration about to begin.
https://globe.adsbexchange.com/?icao=aceeb9
FDC 3/4576 ZFW TX..AIRSPACE WESTLAKE, TX..TEMPORARY FLIGHT RESTRICTIONS. PURSUANT TO 14 CFR SECTION 91.145, MANAGEMENT OF ACFT OPS IN THE VICINITY OF AERIAL DEMONSTRATIONS AND MAJOR SPORTING EVENTS, ACFT OPS ARE PROHIBITED WI AN AREA DEFINED AS 2NM RADIUS OF 325924N0971203W (FUZ344006.1) SFC-2000FT EXCLUDING THE DALLAS FT WORTH CLASS B AIRSPACE. DUE TO HIGH SPEED AERIAL DEMONSTRATIONS AT THE UP SUMMIT EVENT. UNLESS AUTHORIZED BY ATC THE REGIONAL APPROACH 118.1. THE AIR BOSS, JIM CRUM, TEL 229-834-2599, IS THE POINT OF CONTACT. THE REGIONAL /D10/ TRACON, TEL 555-555-5555, IS THE CDN FACILITY. DLY 2230-0040 2310032230-2310050040
https://tfr.faa.gov/save_pages/notam_actual_3_4576.html