404 Day

404 Day is celebrated since April 4, 1991. This very date was chosen because it’s associated with a known error message 4.04. This is a day dedicated to all the internet users who have come across the infamous "Page Not Found" error. This day was first created by a group of tech enthusiasts to bring awareness and humor to this common online occurrence. It's also a perfect opportunity for web developers and designers to showcase their creativity in creating 404 error pages.