April Fool's Day: April Fools' Day (sometimes called All Fools' Day) is an annual celebration in some European and Western countries commemorated on April 1 by playing practical jokes and spreading hoaxes. The jokes and their victims are called April fools. People playing April Fool jokes often expose their prank by shouting "April fool" at the unfortunate victim(s). Some newspapers, magazines and other published media report fake stories, which are usually explained the next day or below the news section in smaller letters. Although popular since the 19th century, the day is not a public holiday in any country.
Cinco de Mayo: is a cultural phenomenon in the United States. It's a time to celebrate Mexican culture and, for some, an opportunity to drink a lot of margaritas and cerveza. But it is also a frequently misunderstood holiday. For those out of the loop, here's a refresher on what Cinco de Mayo is all about.
Anzac Day: is a national day of remembrance in Australia and New Zealand that broadly commemorates all Australians and New Zealanders "who served and died in all wars, conflicts, and peacekeeping operations" and "the contribution and suffering of all those who have served".