All Saint’s Day is a small holiday in Sweden (since I didn’t celebrate it at all while I was there, hence I’m saying it is small), though it is celebrated in other parts of Europe.
While it may be referred to as “Swedish Halloween”, it is only because historically Halloween was a remembrance of those who have passed. Now not as much.
All Saint’s Day in Sweden falls on the Sunday after Halloween. Some countries celebrate it on November 1st, however Sweden and Finland have All Saint’s Day as a weekend holiday.
While I can go into more detail about this holiday, SemiSwede has done a fabulous job, so I will let him tell most of it.