This is the 282nd most frequent Italian word.
occasione
"Occasione" means "opportunity" or "chance" in English.
In this sentence, 'occasione' is used to signify an opportunity or chance to undertake an action, in this case, visiting Rome.
Ho avuto l'occasione di visitare Roma lo scorso anno.
I had the opportunity to visit Rome last year.
Here, 'occasione' serves to indicate a significant or notable event, like the party mentioned.
La festa era un'occasione speciale per rivedere i vecchi amici.
The party was a special occasion to reunite with old friends.
In this usage, 'occasione' represents a circumstance that should be taken advantage of, particularly for gaining knowledge.