#1 Lucia is a holiday at the 13:th of December whena group of people (mostly girls) bring sweet bund and/or sing (often as a choir) most often dessed in a white gown but santas and gingerbread people is more and more common nowdays.
The head (or heads if it's really young kids) are the Lucia and she/he have a crown with candles (electric for kids) and a red ribbon around her/his waist. There are also Tärnor (maids) with tinsel or a leaf wreath in their hair and tinsel or ribbons around there waist.
There is also "stjärngossar" mostly boys/men with a white gown and a paper cone with stars on it.
It's common in churches, schools and daycare but atleast me and my sisters "lussade" for my mother as kids with coffee, gingerbread and sweet buns.
It comes from when Sweden was catholic sinde it's the saint Lucia it's based on (and pree christian myths but thats a little more vauge)