This years Gaur Purnima is on 5th March 2015.
Gaura Purnima is a Gaudiya Vaishanva festival that celebrates the divine appearance of Lord Caitanya Mahaprabhu in Navadwipa, India. Gaura Purnima means “Golden Full Moon”. The name signifies that Lord Caitanya took birth at time of full moon and He blesses everyone with the moonlike rays of His teachings.
Lord Caitanya is non-different than Lord Krishna appearing as His own devotees. He spread the congregation chanting of Holy Name and taught that one can gain enlightenment by chanting Hare Krishna Hare Krishna Krishna Krishna Hare Hare / Hare Rama Hare Rama Rama Rama Hare Hare.