Slava is celebrating only in Serbia. It's and orthodox custom. You surely don't know what is that mean. Well, "Slava" is praising the paricular saint. On that day, we remember our ancestors, praising our saint that "guards" our home, our family... This is one of the interesting Serbian traditional customs, and It cant be described with words- you must participate in it... :D
Niko nema sto srbin imade
Srbin ima svoju krsnu slavu
krsnu slavuu svetitelja Savuuu :D