Gaura-purnima is the most auspicious appearance day of Sri Chaitanya Mahaprabhu. Devotees on this observes fast till dusk. At evening Mahabhishek of Lord Gauranga is performed followed by fast prasadam.
“Let us glorify the boundless merciful Supreme Lord of gods, the prince of Vraja. To taste the intoxicating sweet waves of the nectar of transcendental love for Krishna as well as to give that nectar to others, He has now appeared in the transcendental abode of Navadvipa as Lord Chaitanya Mahaprabhu"
“O most munificent incarnation! You are Krishna Himself appearing as Sri Krishna Caitanya Mahaprabhu. You have assumed the golden color of Srimati Radharani, and You are widely distributing pure love of Krishna. We offer our respectful obeisances unto You”
The Chaturmasya is the four month period, which begins in the month of Asadha (June-July) from Sayana-ekadashi, in the fortnight of the waxing moon. The Chaturmasya ends in the month of Kartika (October - November) on Utthana-ekadashi, in the fortnight of the waxing moon. The month of Kartika is the last month of Chaturmasya. The observance of the Kartik-vrata is one of the most important things for everyone especially for the Vaisnavas. In accordance with these words, the vrata begins on the waxing ekadasi that comes the day after Vijaya-dasami in the month of Ashvina and the vrata concludes on Utthana- ekadasi.
The Kartik Month is the period when the enchantingly beautiful child Krishna starts playing this sweet pastime of stealing butter. Mother Yasoda bound little mischievous Krishna with ropes (daama) around His waist (udara) to the grinding mortar for having stolen butter and thus He came to be known as Damodara. The Lord of the lords thus displays His unlimited mercy by letting His pure devotees to bind Him with the rope of pure love.
The Puranas (Vedic histories) extol the auspicious month of Kartik as the topmost of all the months. It is also known as the month of Damodara and is the most meritorious and purified of all other pure months. Lord Krishna’s mercy is very easily accessible in this month and to demonstrate their sincerity, devotees accept different austerities such as fasting, cutting down on non-essential activities, offering charity, chanting extra rounds of Mahamantra and engaging in the loving devotional services unto the Lotus feet of Shri Krishna. Worship of Tulsi and serving Lord Krishna’s cows is especially glorified.