"Nerdidays" were a thing celebrated for the first couple of years of the site, like holidays for nerds, commemorating occasions such as events in history, video game or TV anniversaries, and other...
A week in December dedicate to appreciating each other, during which every 5 eligible kudos sent out earns the sender a special candle accolade.
RPR's birthday, starting every April 24th.
This Book describes the Special Event known as the Summer Soiree, which is an annual summer event.