Traditional Events
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Christmas Day, 0/12/25, every year
Boxing Day, 0/12/26, every year
New Year's Eve, 0/12/31, every year
New Year's Day, 0/1/1, every year
Valentine's Day, 0/2/14, every year

Yearly Events
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Manned moon landing, 1969/07/21, every year
Unmanned moon landing, 1959/09/13, every year

1999
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Party like it's 1999, 1999/12/31, once

2000
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Party like it's 2000, 2000/12/31, once
Leap day, 2000/02/29, every 4 years
# Leap years occur every multiple of 4 years, but not multiples of 100, unless they are multiples of 400.

2001
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Celebrate the new century, 2001/01/01, every 100 years
Celebrate the new millenium, 2001/01/01, every 1000 years

