This annual event, perhaps the largest university service project in the country, is a tradition for many Dayton families and is open to the public. Nearly 1000 children from Dayton City Schools are paired with UD students for the event, which includes music, a visit with Santa Claus, a tree lighting, crafts, food, and more. UD alumni all over the world hold service events on or around this day, the Feast of the Immaculate Conception.