CFL announced that the Grey Cup 2021 halftime show will be headlined by Keith Urban. The halftime performer will build the hype and entertain the riot as well as viewers around the world. If you are anticipating this big event while on the go, the most sensible option for you is by listening to the Grey Cup 2021 through the local radios. It will be available on Sirius XM. The 108th Grey Cup game is set for Dec. 12 in Hamilton. This is an exciting day for Canadian football.