The roots of many Finnish holidays lie in Christianity. Some of the holidays, such as Christmas and Easter, are public holidays. Many shops and offices are closed during these holidays.
1.1. New Year’s day
March-April: Good Friday and Easter days
1.5. First of May
May: Ascension day and Pentecost
2nd Sunday in May: Mother’s Day
The Saturday between 20th and 26th of June: Midsummer day
The Saturday between 31st of October and 6th of November: All Saints’ Day
2nd Sunday in November: Father’s Day
6.12. Independence Day
24– 25.12.Christmas Eve and Christmas Day
26.12. Saint Stephen’s Day
More information on Finnish holidays is available here.