Weigh-ins for UFC 84 (Keith Jardine)

Weigh-ins for this weekend's UFC 84 event, which features a main event between UFC lightweight champion B.J. Penn and Sean Sherk, take place Friday at the MGM Grand Garden Arena in Las Vegas.The weigh-ins will air live at 7 p.m. ET/4 p.m. PT on MMAjunkie.com's partner site, Yahoo! Sports.Additionally, the event is free and open to the public.Fans in Las Vegas can go to the MGM Marquee Ballroom for a pre-weigh-in autograph session with Kenny Florian, Patrick Cote, Brock Lesnar and Mark Coleman. The signing begins at 12:45 p.m. local time.In addition to the night's title fight, UFC 84 will mark what is likely the last UFC fight for Tito Ortiz, who takes on undefeated Lyoto Machida. Additionally, light heavyweight contender Keith Jardine meets Wanderlei Silva, and Thiago Silva looks to continue his undefeated streak against Antonio Mendes.