World Party Day is based on the idea that peace is not the opposite of war, merely its absence. The real opposite of war is party, and World Party Day aims to synchronise a massive, world-wide party to celebrate everything that’s good and optimistic.
Vanna Bonta almost certainly had no idea when she wrote Flight: A Quantum Fiction Novel that the idea in the book of a global human celebration would really take off. It has though, and people celebrate in all sorts of ways.
“Pass the food and turn up the music” is a common slogan on World Party Day, but it doesn’t really matter how you celebrate, or even whether you celebrate alone or in company. The premise is that everyone in the world is joined in party, so you can really do anything you like as long as it involves celebrating the joy of existence.
(Source : https://www.daysoftheyear.com/days/world-party-day/)