Hour of Code
The Hour of Code started as a one-hour introduction to computer science, designed to demystify "code", to show that anybody can learn the basics, and to broaden participation in the field of computer science. It has since become a worldwide effort to celebrate computer science, starting with 1-hour coding activities but expanding to all sorts of community efforts.
The Hour of Code takes place each year during Computer Science Education Week. The 2018 Computer Science Education Week will be December 3-9, but you can host an Hour of Code all year-round. Computer Science Education Week is held annually in recognition of the birthday of computing pioneer Admiral Grace Murray Hopper (December 9, 1906).