The month of Kartik, the month of Radharani.
Kadamba Kanana Swami: In the Bhagavad-gita 10.35, Krsna says that of all the months, “I am marga-sirsa,” which is a name for the November-December period. It is said that before Krsna, first comes Radha… Radha-Krsna, Radha-Syam, Sita-Rama, like that. First the consort of the Lord is mentioned. Therefore the month of Kartik, which comes before this month of marga-sirsa, is a month of Radharani. It is a month when we are meditating on pure devotional service because she is the proprietor of pure devotional service! No compromise at all, no self-interest whatsoever, only the interest of Krsna in mind and nothing but the interest of Krsna.