Today is "Life In a Day" day. "Life in a Day" is a documentary project being put together by Ridley Scott, Kevin Macdonald, and the YouTube Community.
"What are you doing today? Something routine like cooking breakfast or taking the dog for a walk? Or is it something extraordinary like your child's first soccer game or your wedding day?" asks YouTube, describing the project. "Whatever it is, big or small, we hope you’ll capture it on video and take part in 'Life in a Day,' a user-generated documentary that will tell the story of a single day on Earth, as seen through your eyes."
YouTube users have until 11:59 pm local time to film something for submission. The most "compelling" submissions will be selected for inclusion in the final film.
There is an FAQ page here that gives most of the details you'd probably want to know. It will be interesting to see just how compelling this day turned out to be, once the project is finished.