2021 UFC event schedule: Kamaru Usman vs. Gilbert Burns, Alistair Overeem vs. Alexander Volkov on tap | CBS Sports Headlines 2021 UFC event schedule: Kamaru Usman vs. Gilbert Burns, Alistair Overeem vs. Alexander Volkov on tap The MMA leader turns its attention toward 2021 with a few events already on … Continue reading 2021 UFC event schedule: Kamaru Usman vs. Gilbert Burns, Alistair Overeem vs. Alexander Volkov on tap