In December 7, Dango ceremony is held at Katori Shrine. It is the religious ceremony to pray healthy grow for boys and girls. Usually, the food to serve gods is taken Sake, but because this ceremony is for children, there is no Sake served but they use Dango.
Therefore, this Dango is called Yakuotoshi Dango and it will protect you from disaster.
There are several Dango shops which serves many kinds of Dango.