Kathina Day is the robe offering ceremony that marks the end of the 3 month rains retreat. During the Buddha's time, it's a joyous ocassion as fellow diciples of the Buddha emerge from the forest with greater spiritual attainment under the guidance of Lord Buddha himself. Many of them attain arahanthood during the retreats.Today, this is a day which we are reminded of the great attainments of monks and nuns. We as lay disciples of the Buddha support the the Sangha by providing clothing and basic necessities. Its a day to practice giving (Dana) and gratitude towards our spiritual teachers for their guidance and support.