Tomorrow is Easter, many People in Poland celebrate.
Wesołych Świąt - happy Holidays is what you say to Polish people to say Happy Easter.
Easter is Wielkanoc (literally Great Night).
You all already know that eggs=jajka
but painted eggs = pisanki
and the Easter Monday is "Lany Poniedziałek "/ "Śmigus-Dyngus" (Wet Monday)