Fall of Lord Voldemort celebrations

In early November 1981, a number of celebrations were held by wizards to celebrate what they believed to be the fall of the Dark Wizard Lord Voldemort. These celebrations were held without regard for the International Statute of Wizarding Secrecy, resulting in various Muggles noticing oddities.

Details
As Vernon Dursley went about his business on 1 November, 1981, he noticed a number of odd activities. An unusual number of strange people wearing cloaks were gathered in the streets near his workplace, Grunnings. That evening on the news, there were reports of shooting stars and hundreds of owls flying everywhere since sunrise.

Minerva McGonagall mentioned these oddities to Albus Dumbledore, who did not seem bothered by them and suggested that they attend one of the gatherings. McGonagall considered the whole business irresponsible, particularly the shooting stars in Kent that she suspected were the work of Dedalus Diggle.

For her part, Millicent Bagnold, British Minister for Magic at the time, chose not to take any action against the festivities, stating "I assert our inalienable right to party."

Appearances

 * Harry Potter and the Philosopher's Stone
 * Pottermore