GIS Day is an international day for users of geographic information systems (GIS) technology. It's a chane to show real-world applications that are making a difference in our society.
The first formal GIS Day took place in 1999. Esri president and co-founder Jack Dangermond credits Ralph Nader with being the person who inspired the creation of GIS Day. He considered GIS Day a good initiative for people to learn about geography and the uses of GIS. He wanted GIS Day to be a grassroots effort and open to everyone to participate.
A map with all of the GIS Day events across the globe is on the International GIS Day website: https://www.gisday.com/en-us/overview (scroll down for map).
Register your event to appear on the map at http://www.gisday.com/register.html and receive extra benefits such as a software donation from ESRI.