Cornwall Holiday celebrates St. Piran Day. This is a made up holiday for Cornwall. Reasons why he celebrates this holiday are unknown. That is the holiday he celebrates.
The day Jesus arose from the dead is called Easter.
Samhain is a Wicca/Celtic Sabbat (holiday) that honors the dead and celebrates the passing of all things bad, and hope for the future.
Muslims celebrate it
Easter
Celebrates African traditions
The holiday of Shavuot celebrates the giving of the Torah and the laws contain therein.
Carnival.
Juneteeth
Thanksgiving
i do not know
1st August.