This is the 5073rd most frequent Polish word.
premierowe
"Premierowe" means "premiere" or "first-time" (related to a debut or first showing).
Here, 'premierowe' is used adjectivally to describe 'pokaz', illustrating that it is a premiere screening.
W kinie odbyła się premierowe pokaz filmu.
In the cinema, a premiere screening of the movie took place.
In this example, 'premierowe' again functions as an adjective, modifying 'wystąpienie', emphasizing that it is the first or debut performance.
Mieliśmy przyjemność oglądać premierowe wystąpienie znakomitego aktora.
We had the pleasure of watching the premiere performance of an excellent actor.
Here, 'premierowym' is the instrumental form of the adjective, describing 'wydarzeniu', indicating the event is a premiere occurrence.