Major holidays in Serbia are pretty much the same as elsewhere in Europe, but there is one family holiday that is associated almost exclusively with Serbia. Every orthodox family has its patron saint, and all family members are entitled to a day off work (children are entitled to a day off school, also) as if it were a national holiday. On that specific day, families invite their friends for dinner as they thank their patron saint for successful year. Patron saint is transferred from father to son and women claim their husbands’ saint as they marry.
Further information is available on: http://wonderfulserbia.com/destination/tradition/krsna-slava/