After two decades at the sands, the JCK show has moved to a sunnier spot on the ­southern end of the strip. Herewith, five ­“itineraries” to help you survive—and thrive—during the ­industry’s biggest week of the year.Inside InfoFrom May 31 to June 7, the Mandalay Bay Events Center hosts a confluence of jewelry shows across nearly 1 million square feet of exhibit space divided between two levels.There’s nothing same-same about Las Vegas this year. Whether you’re a 20-year veteran of the JCK show or a newbie to the constellation of trade fairs taking place in the Nevada desert this month, you’re about to discover what the largest jewelry show in the nation looks like at its new venue, Mandalay Bay, where a new floor plan, arranged by product categories, promises to make the buying experience for retailers easier and more intuitive.That’s a good thing. As you well know,