noun, noun which may take the genitive case particle 'no'
national holiday; festival day
Can refer broadly to a public or national holiday, and more literally to the day of a festival or religious observance. For the official modern term for a public holiday, 祝日 is often more precise.
今日は祭日なので銀行は休みです。
The banks are closed today because it is a national holiday.
神社の祭
Many people gather on the shrine's festival day.