What such pasola?

"Knightly" tournament in Indonesia In February-March, in some days after a full moon, the sea at the Indonesian island of Sumba as if boils and starts shining. Such effect is caused by worms-polikhety emerging to a surface from the sort Eunice, called here "nyala". Having waited for this moment, local priests put out at dawn to sea that by quantity and appearance of worms to make predictions for future crop. Then other action begins: ashore there are men in clothes from traditional color fabrics — to hiccup. They saddle horses and, having divided into two groups, on full skaku...