Vap Poya marks the end of the 3 month retreat by Buddhist priests known as the Vas 'rainy' season. The 'Vas' retreat which starts on Esala Poya comes to an end on Vap Poya, and from that point begins the 'Katina' period. This period lasts for the duration of a month until the following Poya Il in November. On Vap Poya 'Katina Cheea' or new robes are offered by aficionados of the Temples to Bhikkhus who watched the 'Vas' season and this is viewed as a standout amongst the most exemplary deeds in Buddhism. In fact the word 'Katina' implies unbreakable and alludes to the legitimacy picked up by offering this 'Katina Cheea' to one of the Maha Sangha.
It is taken in procession Katina Perahera alongside different blessings from the common people to the temple where the gift service happens. Vap Poya was huge notwithstanding during the life and times of Lord Buddha numerous hundreds of years back. It was on such a day, that the Buddha finished a 'Vas' withdraw for the seventh time since accomplishing enlightenment. He had invested this energy in the heavenly dwelling place Tavatissa, where he had lectured the Abhidhama to the gods headed by Matrudeva. He finished the retreat by descending close to the gates of Sankassapura where he preached the Dhamma to devotees flocked there.