This is the 7346th most frequent Polish word.
kaszubska
"Kaszubska" means "Kashubian," relating to the Kashubian people, their language, or culture.
In this example, 'kaszubska' characterizes the dinner, suggesting that it features Kashubian cuisine or customs.
Znajomi zaprosili mnie na kaszubską kolację.
My friends invited me to a Kashubian dinner.
In this sentence, 'kaszubska' is used as an adjective describing the music, indicating its association with the Kashubian culture.
Słyszałem kaszubska muzykę na festiwalu.
I heard Kashubian music at the festival.
Here, 'kaszubska' modifies 'tradycja' (tradition), showing it pertains to the traditions of the Kashubian community.