Vas Aradhana is the practice of monastics rains retreat which starts each year on full moon of July and ends on full moon of October. This is a tradition that passed down from time of the Buddha. Devotees officially invite monastics to observe this retreat for three months. During this period, devotees pledge to provide four requisites (food and drinks, clothes, shelter and medication). In return, they get an opportunity to listen the Dhamma and practice meditation with monastics. At the end of the three months, Robe Offering Ceremony is being held. Devotees get a wonderful opportunity to offer a special robe called Kathina.