More parties from Sundance, and this one's a doozy. Tava, the new zero calorie beverage, is having a bash at Tao's Park City outpost, with a Little Birdy saying "huge production budget launch of new Pepsi product." The budget is so huge that Pepsi managed to snag performances by One Republic and Keri Hilson. Uhhh. Sweet. Zero Calorie Sweet.