World Usability Day (WUD) or Make Things Easier Day is held annually on the second Thursday of November. It is single day of events occurring around the world that brings together communities of professional, industrial, educational, citizen, and government groups for our common objective: to ensure that the services and products important to life are easier to access and simpler to use (https://worldusabilityday.org/)
World Usability Day was started in November 2005 by the Usability Professionals Association, (now the User Experience Professionals Association), to promote the values of usability, usability engineering, user-centered design, universal usability, and every user's responsibility to ask for things that work better.
What is Usability?
Usability is a quality attribute that assesses how efficiently and effectively a person can use a product and how satisfied he or she is with the process. When usability standards are met, the product’s interface is transparent, and the cognitive load caused by the interface is low.