Josh Koscheck, Jon Jones and Renzo Gracie join Brandon Vera for UFC 109 weigh in events

The official weigh-in event for UFC 109: "Relentless" is set to take place at the Mandalay Bay Events Center in Las Vegas, Nevada, on Friday, Feb. 5, 2010.

For those fortunate enough to be in "Sin City" for the promotion’s return trip to the Mandalay Bay, remember that the weigh-in is FREE to attend and open to the public. Doors to the weigh-in will open at 3 p.m. local time for the general public.

The first fighter is expected to tip the scale at 4 p.m. PT.

To get things started, UFC light heavyweight Brandon Vera will host a special Q&A session (exclusively for UFC Fight Club members) from 2-3 p.m. local time. Joining him in the pre-event festivities will be Josh Koscheck, Jon Jones and Renzo Gracie, who will be available for fan autographs from 1-3 p.m. PT.

UFC 109: "Relentless" will feature a light heavyweight battle between elder statesmen Randy "The Natural" Couture and Mark "The Hammer" Coleman. Middleweights Nate Marquardt and Chael Sonnen will battle in the co-featured fight of the night for perhaps an opportunity to challenge the winner of Anderson Silva vs. Vitor Belfort later this year.

Here’s the current UFC 109 fight card:

Main event:

205 lbs.: Mark Coleman vs. Randy Couture

Main card (Televised):

185 lbs.: Nate Marquardt vs. Chael Sonnen
170 lbs.: Paulo Thiago vs. Mike Swick
185 lbs.: Demian Maia vs. Dan Miller
170 lbs.: Matt Serra vs. Frank Trigg

Under card (May not be broadcast):

155 lbs.: Mac Danzig vs. Justin Buchholz
155 lbs.: Melvin Guillard vs. Ronnys Torres
185 lbs.: Rob Emerson vs. Phillipe Nover
205 lbs.: Brian Stann vs. Phil Davis
265 lbs.: Tim Hague vs. Chris Tuchscherer
265 lbs.: Rolles Gracie vs. Mostapha Al Turk

Remember that MMAmania.com will provide LIVE round-by-round, blow-by-blow coverage of the main card action on fight night (Saturday, Feb. 6), which is slated to air at 10 p.m. ET on pay-per-view from Las Vegas. The latest quick updates of the live action will begin to flow earlier than that around 8 p.m. ET with the preliminary bouts.

It’s going to be a fun night of fights so don’t miss it. And remember to check us out for all the pre, during and post-fight UFC 109 coverage you can handle.