The Incarnation For The Age
In the various parts of the world, the celebration officially falls on either March 26 or March 27, and in the US and UK on March 26. So some ISKCON centers will celebrate on Sunday, and others on both days.
LORD KRSNA SAYS in the Bhagavad-gita that He comes to this world age after age to establish religious principles. Five hundred years ago, Krsna came as Sri Caitanya Mahaprabhu, whose identity is confirmed in Srimad-Bhagavatam, Mahabharata, and other Vedic scriptures. Although He is Krsna Himself, Caitanya Mahaprabhu came disguised as a devotee of Krsna to teach people how to serve Krsna.
At the end of the Bhagavad-gita, Lord Krsna advised us to surrender completely unto Him and promised us all protection as His devotees. Unfortunately, people do not want to surrender to Lord Krsna. So when Lord Krsna returned as Lord Caitanya, He came with the same mission but performed it a different way. As Lord Sri Krsna, the Supreme Personality of Godhead, He ordered us to surrender unto Him, but as Lord Sri Caitanya Mahaprabhu He taught us how to surrender. Therefore He is considered the most merciful incarnation of Krsna.
When Lord Caitanya taught the process of Krsna consciousness, He emphasized the chanting of the Hare Krsna maha-mantra: Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare. If one wants to become a devotee of Krsna, one must take shelter of Sri Caitanya Mahaprabhu and the chanting of the holy names of the Lord.