Jesuits eh. Interesting. Most of what I know of them is that they used to be the Pope's private spy force back in the day...
An amusing thing to note is that the majority of Swedish feastdays and much of their celebration are, in fact, pagan - and nobody really cares much about the christian ones. The most important theme in our holidays remain, getting piss-drunk.
The "big" holidays in Sweden are Midsummer, Midwinter/Yule, New Year's and Walpurgis (30th of April/1st of May). Yule ("Jul" in swedish) has of course been set upon by the christian tradition like bloodhounds, but the big elements remain the same. Yes, the Advent is a purely christian tradition, but on the other side, Lucia is just a pagan tradition stamped with a random Italian saint and released back into the wild. While there's no sacrifice to be spoken of, the enormous feasts around the blot (Julbord) remain.
Midsummer is originally a fertility festival, and whatever the christians may think of it we still erect a 20 meter tall pole with 2 balls hanging from it every year, and dance around it like silly people and get piss-drunk and screw each other in the aftermath of that.
New Year's is the festival of bombs and explosions. Oh, and getting piss-drunk.
WALPURGIS (Valborg) is the festival of making an enormous fucking bonfire and getting piss-drunk. Uppsala is the national capital of this holiday, where it has been partitioned into a few easy-to-remember feastdays:
"Skvalborg" on the 28th, where the students start ramping things up and drinking their heads off.
"Kvalborg" on the 29th, where the students keep the pressure up and most notably
half of the city's non-student population leaves town in order to avoid the chaos. They are of course replaced by more students elsewhere.
Valborg on the 30th, when the chaos is complete, with the annual river bash (people build floats and enter them in a rafting contest down the Fyris river in the middle of the city-center), the outrunning, and of course, bonfires everywhere. This is
the day to be in Uppsala.
"Totalborg" on the 1st of May, when half the people are still hung over, half the others are out being political and the rest of town starting to trickle back home. This is pretty much the after-party to 3 straight days of partying, and it's crazy.
I'll give you coverage of it later

Nobody really cares much about easter except for the fact that you get a few days off work or a week off school, and you get an excuse to buy insane amounts of candy. Be ware - we do our Trick/Treat games on Maundy Thursday. You also paint eggs, hide candy-filled eggs and eat a lot. Oh, and let's not forget - get piss-drunk.
Halloween et al...nobody really cares, unless someone they knew died recently.
What are the big holidays where you live?