For years, summer-league founder and NBA coaches agent Warren LeGarie’s welcome party was in a bright, barren hotel ballroom with a few trays of food warming against the walls, beer and wine in the corner, and tables to stand around and chat. Now it’s a swanky rager at a Wynn hotel bar, where the bartenders are straight out of “Cocktail,” the room is illuminated by black lights, a DJ is blistering tunes through loudspeakers and cornhole boards are set up on the patio next to a lagoon covered with lily pads. Agents, influencers, basketball decision-makers, spokespeople and, yes, us writers are invited.