In January, Mandalay Bay Convention Center unveiled a $70 million, 350,000-square-foot expansion that makes it the fifth-largest exhibition venue in the United States in both total square feet and exhibition space. For JCK Las Vegas showgoers, that means one thing: Prepare to navigate a sea of change. Brand-New Bayside The show, now in its sixth year at Mandalay Bay, has devised a novel layout to take advantage of the expanded lower Bayside level. The redesign spawned an initiative, according to the show, to “intelligently rearrange” booths and group similar product categories together. The upshot: More than 2,400 vendors will be in new locations. Get up to speed at jckonline.com/lasvegas/plan. The Bridge  Bayside will welcome a new neighborhood, The Bridge, dedicated to trendy fashion jewelry. “We have both large brands—ranging from Charriol, Thomas Sabo, and To