As the 2026 Winter Olympics come to an end Sunday, NBCUniversal is officially kicking off its marketing campaign for the 2028 Summer Games in Los Angeles. During the closing ceremonies of the Milan-Cortina games, NBC debuted a two-minute film, starring Kate Hudson and a flurry of summer Olympics stars, set to the tune of The Mamas & The Papas’ 1966 classic “California Dreamin’” and ending with NBC’s LA28 logo, which replaces the “A” with the iconic peacock logo. The spot, titled “LA28 Dreamin’,” tees up the next games, which some inside NBCU are betting on being a massive ratings draw, given the U.S. setting, and the addition of sports like baseball, softball, flag football and squash. It was filmed across the city, from Downtown L.A. to Venice Beach, the 6th Street Bridge and the Los Angeles Memorial Coliseum. NBC has also lined up 28 L.A. institutions to share the spot on social media, including the Griffith Observatory, the Hollywood Walk of Fame, SoFi Stadium and Universal Studios Hollywood. “As the world gathers in Milan to …