AATB and Donor Alliance will host the Donor Dash 5K run/walk event in Denver on Sunday. The event recognizes the contributions of tissue and organ donors and celebrates the lives of recipients. "Transplant recipients often walk in honor of their donors' lives and in celebration of the miraculous gift they were given. Donor families walk in memory of their loved ones and in reverence to the selfless gifts they gave. It is the people that make this event so special," said Donor Alliance CEO and President Sue Dunn.