Wave goodbye to summer and join the annual Tivoli Day street fair and block party. Tivoli Day, an old-fashioned September festival downtown Oak Bluffs has been MV's tradition for 4 decades. It's a day to celebrate all the hard work of the summer and to welcome beautiful Island fall. Live entertainment, street vendors, dancing, arts, end-of-the-summer sales, food and more food. Ring Challenge at the Flying Horses.