Official fighter weigh-ins for next month's "UFC 126: Silva vs. Belfort" event are set for Feb. 4. Las Vegas' Mandalay Bay Events Center, which also hosts the following day's pay-per-view event and Anderson Silva vs. Vitor Belfort headliner, plays host. Doors open to the general public at 6 p.m. ET (3 p.m. PT local time), and the first fighter hits the scale at 7 p.m. ET.