Arunachal pradesh state government holiday list 2014

       Month & Date           Day of week              Occasion/Festival

  1st January           Wednesday              New Year’s Day
  14th January           Tuesday              Makar Sankranti/Magh Bihu
  26th January           Sunday                      Republic Day
  20th February   Thursday              Statehood Day
  27th February   Thursday              Maha Shivratri
  17th March           Monday              Holi
  15th April           Tuesday              Bohag Bihu/Vaisakhadi
  18th April           Friday                      Good Friday
  14th May           Wednesday              Buddha Purnima
  29th July           Tuesday              Idu’l Fitr
  15th August           Friday                      Independence Day
  18th August           Monday              Janmashtami
  2nd October           Thursday              Mahatma Gandhi’s Birthday
  3rd  October           Friday                      Dussehra
  6th October           Monday              Idul Zuha (Bakrid)
  23rd October           Thursday              Diwali (Deepavali)
  6th November   Thursday              Guru Nanak’s Birthday
  1st December   Monday              Indigenous Faith  Day
  25th December   Thursday              Christmas Day

Know the official announcement from this link