Countdown To UFC 142 Rio Jose Aldo vs. Chad Mendes: UFC 142, which is the UFC's first of 2012, takes place Saturday at HSBC Arena in Rio de Janeiro. UFC 142's main card, including the co-headliners, airs on pay-per-view. The prelims air on FX and stream on Facebook. Despite Brazil being three hours ahead of the U.S. East Coast, the event airs live in its normal Saturday-night timeslot with prelims at 8 p.m. ET (5 p.m. PT) and the main card at 10 p.m. ET.