Every year, November 21 is World Hello Day. The objective is to say hello

Hello

Hello is a salutation or greeting in the English language. It is attested in writing as early as the 1830s.-First use:Hello, with that spelling, was used in publications as early as 1833. These include an 1833 American book called The Sketches and Eccentricities of Col...

 to ten people on the day. By greeting others, the message is for world leaders to use communication

Communication

Communication is the activity of conveying meaningful information. Communication requires a sender, a message, and an intended recipient, although the receiver need not be present or aware of the sender's intent to communicate at the time of communication; thus communication can occur across vast...

 rather than using force to settle conflicts.

The event began in 1973 by Brian and Michael McCormack in response to the Yom Kippur War

Yom Kippur War

The Yom Kippur War, Ramadan War or October War , also known as the 1973 Arab-Israeli War and the Fourth Arab-Israeli War, was fought from October 6 to 25, 1973, between Israel and a coalition of Arab states led by Egypt and Syria...

. Since then World Hello Day has been observed by people in 180 countries.