The city’s tourism board agreed to extend several multiyear contracts with an approved total spending cap of more than $460 million for a handful of third-party advertising and marketing agencies. The Las Vegas Convention and Visitors Authority board of directors on Tuesday approved extensions and updates to five interconnected agency contracts, as the authority’s leadership emphasized the need for speed, flexibility and scale in promoting the destination. “Las Vegas is not the typical brand. It operates at an entirely different speed and scale,” Kate Wix, LVCVA’s chief marketing officer, explained to the board members why the multiagency effort has proven to be successful. “The pace of events, partnerships, media opportunities and cultural moments is non-stop, and our marketing capabilities have to move just as fast.” The largest of the approved contracts is a three-year, $309 million advertising and marketing agreement with R&R Partners, with an optional two-year, $221 million extension.…