Kartika is the most important month of the year for Gaudiya-vaisnavas. Devotees take special vratas to celebrate this month. Kritika is one of the names of Srimati Radharani, while another one is Urja. Therefore, this month is sometimes also called Urja and the vows are called urja-vrata. Urja means energy, thus, it is the most powerful month of the year, during which we can feel the helping raise of Srimati Radharani.