Australia Day
The anniversary of the landing of the First Fleet under Captain Arthur Phillip at Port Jackson in New South Wales on January 26th, 1788.
Here’s the official site, and more information at Wikipedia.
[I should note that recently this has taken on most of the controversy of Columbus Day in the US, with some people noting the event being celebrated was actually an invasion. I have no right to an opinion on the controversy. Also, the 25th in the US is the 26th in Australia, The Date Line again.]
