Leap year. It happens in February. february, and it occurs on leap years
There is no particular name for that occurrence.
because it is the only month that has the less amount of days
Every other month is commonly referred to as "every second month." For example, if January is the initial month, the following month would be March.
The average occurrence is once every 1.0025 years (during every 400 years it happens 399 times).
There are a great many things that could happen on every 4th Wednesday in a school. Treats could be passed out for example.
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The second full moon of any month is called a 'blue moon'. It is a rare occurrence. The saying 'once in a blue moon' means that something does not happen very often.
A second full moon in a calendar month is referred to as a Blue Moon. This rare occurrence happens about once every 2-3 years.
The Jewish festival that is celebrated every month is called Rosh Chodesh, which marks the beginning of a new month in the Jewish calendar.
February is the month that has an extra day in leap years.
The sun makes us add another day.