West Bengal State Government holiday list 2014

Birthday of Netaji                            23rd January
Shree Panchami                              4th February
Birthday of Dr. B.R. Ambedkar    14th April
Bengali New Year's Day                 15th April
Good Friday                                     18th April
May Day                                           1st May
Birthday of Rabindranath Tagore 9th May
ID-UL-Fitar                                     29th July
Independence Day                          15th August
Mahalaya                                          23rd September
Durgapuja                                         1st-3rd October
ID-UD-Joha                                     6th October
Lakshmipuja                                    7th October
Kalipuja                                             23rd October
Muharram                                        4th November
Birthday of Gurunanak and           6th November
Parswanath's Rathajatra 
Christmas Day                                 25th December

Some holidays are not mentioned as the appeared on Sunday. Dates are 12th January, 26th January and 16th March              

Know the official announcement from this link