Kartik Vrat Udyapan (Karthika Masa Vratha Udyapanam) is observed on Kartik Purnima (Karthika Pournami). In 2020, Kartik Vrat Udyapan date is November 30.
The pujas, all other rituals, rules and code during the month are called as Kartika Masa Vratam. There are certain rules and codes to perform Kartika Masa vrata. The Karthika Purana details the rituals and customs to be performed during the month of Karthik.
In 2020, Kartik Month begins on 16 November and ends on December 14 as per Gujarati, Marathi, Kannada & Telugu & Goa calendars. In 2020, Kartik Month begins on November 1 and ends on November 30 as per North Indian Hindi Calendar
Here is the detailed vidhi of Kartik Vrat Udyapan (How to conclude Kartik Maas Vrat)..