Leap year
The Olympics.
One example of an event that occurs once every four years is the Olympic Games. The Summer and Winter Olympics alternate every four years, providing athletes from around the world the opportunity to compete on a global stage. This quadrennial event showcases a wide range of sports and brings nations together in the spirit of competition and sportsmanship.
Commonwealth Games
You have the world cup, the U.S president is elected, the Olympics are held , and so is the Euro cup. This all happens every four years.
Oh, dude, something that happens every 4 years? That's easy, man. The Olympics! It's like a massive global sports party that comes around every four years, where athletes from all over the world compete for gold medals and national pride. So yeah, mark your calendars, because the Olympics are like the ultimate every-four-years event.
Could it be the Olympics.
29th of February only happens in a leap year. So it only happens every 4 years.
When used as an adjective, it means occurring every, or last for, four years. As a noun, it references an event that occurs every four years. (see: http://dictionary.reference.com/browse/quadrennially )
eclipse
Some things that happen once every four years include: - Leap Years - US Elections - The Olympics
The President of The United States of America is inaugurated.
The Olympics are held once every fourth year.