In autumn in Koyasan, you may see many people gathering with some plastic bags or with a big apron spreading in front of the shrines. They are waiting for rice cake being scattered.
Appreciating the autumn harvest, they offer their harvest (mainly the products made of rice) in front of the shrine and share the great joy of the harvest.
So once you meet this occasion, why don't you try to join.
But I'm afraid you may be very surprised to see Japanese people having waited quietly for a long time suddenly changed into wild crowds only getting some rice cake.
Please protect yourself from excited Japanese who scramble for rice cake.