The Shamrock Shuffle is an annual endurance event supporting the Zelienople Rotary Club, featuring a variety of race options including a Half Marathon, 5K, and 1 Mile. Participants can choose to compete in one race, two races, or all three events as part of a challenge. The Half Marathon offers a hilly course, while the 5K and 1 Mile races are set through the streets of Harmony. The event includes unique features like Jell-O Shots for eligible runners and staggered start times to accommodate all participants.