Friday March 19th 2:35 PM. This race will be at Sebring Raceway. There looks like there will be 15 TCR entries.
Full event listen here with the time etc.
2021 MOBIL 1 TWELVE HOURS OF SEBRING PRESENTED BY ADVANCE AUTO PARTS | IMSA
IMSA.TV for video and radio. You may need a VPN for the live videos its block here in the USA quite often.