As far as I know, there are only two holidays in the Slovak calendar that make people to willingly drive tens, even hundreds of miles across the country to be with their family: Christmas and All Saints’ Day. The only difference being that the former is to be with the living, while the latter is to be with the dead.
You can say whatever you want about the Slovak people but one thing no one will ever be able to deny is the importance of traditions. Be it political achievements (like beating the Communists or the birth of the Slovak nation state in 1993) or Catholic feast days (like pretty much all major ones, including Three Kings, Easter, All Saints and Christmas), Slovaks love to celebrate these moments (as they should). More importantly, however, they love to celebrate these moments with each other. Because directly connected to the importance of tradition is the inherent importance of family.