First of all; I don't know much about the special holidays we have in Sweden which is pretty poor. I've got a vague idea about most of them but not much more.
This website attempts well in listing all of them and provides one text in Swedish and one in English. Now, having this website I can not only fill up my own knowledge but hopefully I will now also be able to explain some of our weird traditions to English speaking people.
This also led me to find Kalender.se which is what you can guess: a calendar in Swedish style. Interestingly it has the Swedish name days on it. Great work!