Where is leap year celebrated and by whom?

Answer 1

Leap Year isn't a holiday, and isn't really "celebrated". It's an adjustment to the calendar that's

necessary in order to keep the year on schedule with the sun.

If there were no leap years, then the seasons would keep getting earlier. After about 320 years,

the first day of Spring would happen on January 1, summer would start around April 3, autumn

would begin around July 4, and Winter would arrive around October 4.

Every community and culture in the world that uses a calendar, or trades goods or communicates

with any other culture or community that uses a calendar, incorporates some kind of 'leap' adjustment

in their calendar.

Answer 2

Perhaps it's best you rephrase and try again.