Crystal Bridges Museum of American Art and its contemporary art and performance venue, the Momentary, in Bentonville, have promoted Lela Davidson to chief operating officer. . . .Before joining Crystal Bridges, Davidson was executive vice president at Saatchi & Saatchi X in Springdale, where she led marketing teams for major clients like Procter & Gamble, Coca-Cola and Samsung. Before that, she launched a media business (One Country Media) inside the venture-backed e-commerce retailer Country Outfitter….