A national holiday.
This holiday was created in memorial to the epic importance of the day that Harry Potter defeated the Dark Lord. Also, this day is one to lament over the lives lost in that historical battle at Hogwarts.
We celebrate this Holiday by mimicking the attire of all who fought in the battle. We consume butter beers, in respect to the children's favorite drink. Also, we carry around wands, and control everything with spells.
Please respect this holiday, and do not mock, for if you do, our powers will overcome you.
"Do you remember May 2nd?"
"Of course I do, that day will forever be in my heart!"