Annual event
biannual
Biannual
biannual...
A eight day festival called "Paryushan Parv" is regarded as major event for the Jains. It occurs in the months of August-September every year.
a persons birthday on the day of a leap year
People born on a double leap year
Australian Open - Tennis
A 10 year anniversary is called a decennial.
Biannual
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, every year there is an event called Pogopalooza, hosted by Xpogo.com
An annual event occurs once a year.