From a post by NBC it states there that "First Ever 'Twilight' TwiCon Expected To Sell Out", more excerpts of the post below: This year's first ever "Twilight"-inspired convention, TwiCon, will be held on July 30-August 2 at the Sheraton Dallas Hotel in Dallas, Texas. Despite the $255 conference registration and $139 hotel room rate, the event is expected to sell out. "We have 2,500 tickets for…