The annual Green Thumb Gala, now in its 15th year, is a major fundraiser for the Knoxville Botanical Garden and Arboretum and features cocktails, silent and live auctions, garden tours, seated gourmet dinner and live music. Cocktails begin at 5 p.m., followed by 6:30 p.m. dinner and 7:30 p.m. live auction. Attire: garden party.