LAS VEGAS – The traditional pre-event press conference for this week’s UFC 137 show takes place today, and you can watch a live video stream of the festivities here on MMAjunkie.com. Today’s event, which is open to fans, takes place at Las Vegas’ Brooklyn Bridge at New York-New York Hotel & Casino with UFC president Dana White and UFC 137 fighters B.J. Penn, Nick Diaz, Matt Mitrione, Cheick Kongo, Mirko Cro Cop Filipovic and Roy Nelson. The video stream begins at 4 p.m. ET (1 p.m. PT local time)…