This is the 8627th most frequent Polish word.
publicznej
"Publicznej" means "public" or "of the public" in English, typically used in the feminine singular or genitive/dative form.
Here, 'publicznej' modifies 'debacie' to indicate that the debate is accessible to the general public.
Wzięliśmy udział w publicznej debacie.
We participated in a public debate.
In this sentence, 'publicznej' describes the school as being operated by the government and serving the community.
Mój brat pracuje w publicznej szkole.
My brother works in a public school.
The term 'publicznej' here relates to 'imprezie,' indicating the event is open to the public or involves the community.