This is the 8th most frequent Norwegian word.
det
"Det" in Norwegian means "it" or "that" in English.
Here, 'det' functions as a demonstrative pronoun to refer to an object.
Det er en pen bok.
That is a nice book.
In this case, 'det' is a pronoun used as the subject of the sentence, referencing the event (the party).
Hvordan var det på festen?
How was it at the party?
Here, 'det' serves as a dummy subject to fulfill grammatical requirements for a subject in the sentence.