Purnimant Calendar is followed in Rajasthan, Uttar Pradesh, Madhya Pradesh, Punjab, Himachal Pradesh, Orissa, Bihar.
But all the festivals will fall on the same day as per Gregorian calendar.
For understanding more, read about Amant & Purnimant Calendars.
List of Festivals in Magh Masa or Magha Masam
Know more about 12 Hindu Months.