Summer hasn’t even started, but marketers are already gearing up for the all-important holiday selling season—a time when fragrance sales goals are made or missed. Avon is counting on a little star power to make plan. In November, the company will launch In Bloom, a celebrity scent from Academy Award-winning actress Reese Witherspoon. The launch is the largest fragrance initiative this year for Avon, which has been expanding its fragrance house by working with designers such as Emanu...