IPA: /ˈfɛstəvəlˌɡoʊər/
KK: /ˈfɛstəvəlˌɡoʊər/
A person who goes to a festival to enjoy the events and activities.
As a festivalgoer, she loves to experience live music and food from different cultures.
Festivalgoer → It is formed from "festival" (from Old French *festival*, meaning a feast or celebration) and "goer" (meaning a person who goes). A festivalgoer is a person who attends a festival or celebration.
Think of someone who 'goes' to a 'celebration' — that's what a festivalgoer is.