people will taking keep going to collect a kind of flowers are resemble with Fingerroot or turmeric. The flowers are yellow or white
Its name is “Dok Khao Pansa”
which blooms only the Buddhist Lent at Saraburi province only.
While the monks walked up the stairs to offer flowers lend worship footprint of the Buddha. People put a container with water and Bullet wood floating on the water to "Washing the feet of the monks".