Interluxe Group, a luxury marketing agency that works with over 250 brands ranging from Rolls-Royce to The Four Seasons, is deepening its focus on performance marketing as agency expectations evolve for luxury brands. The firm, which focuses on events and media, has acquired adMixt, a performance marketing agency that works primarily with digitally-native brands like Westman Atelier and Mizzen + Main. Terms of the deal were not disclosed.