I think you are asking about a census.
An event that happens every other year is called a "biennial" event. This term is derived from the Latin "biennium," meaning "two years." Such events can include things like festivals, conferences, or exhibitions that occur once every two years.
yes i'm positive it happens every year
It is a triennial event. A triennial event happens three times a year.
An annual event
The word for an event that happens every year is "annual." This term is commonly used to describe recurring events, such as festivals, meetings, or celebrations that take place once each year.
Annual.
weekly
The running of the bulls in Pamplona.
Leap year
monsoon rains
An event occurring every two years is referred to as a biennial event. This pattern indicates that the event happens once every two years.
Yes it happens every year in Canada on the 1st of July.