An eagerly awaited autumnal tradition will get the blood pumping on September 21 and 22, as the weekend brings with it the Vibrant Arena at the MARK's Active Endeavors Health & Fitness Expo on Saturday followed by the 27th Quad Cities Marathon, presented by TBK Bank, on Sunday, the latter a Boston Marathon qualifier and the only such event in the country to incorporate six races, four cities, three bridges, two states, and one island.