New Year's Day: January 1 – Thursday
Thirteenth Day: January 6 – Tuesday
Good Friday: April 3 – Friday
Easter Eve: April 4 – Saturday*
Easter Day: April 5 – Sunday
Easter Monday: April 6 – Monday
May Day: May 1 – Friday
Ascension Day: May 14 – Thursday
Swedish National Holiday: June 6 – Saturday
Pentecost: May 24 – Sunday
Midsummer Eve: June 19 – Friday*
Midsummer Day: June 20 – Saturday
All Saints' Day: October 31 – Saturday
Christmas Eve: December 24 – Thursday*
Christmas Day: December 25 – Friday
Boxing Day: December 26 – Saturday
New Year's Eve: December 31 – Thursday*

* Not a red day, but a holiday for most of them.