World Read Aloud Day was created by the non-profit LitWorld. It is sponsored by Scholastic. It is celebrated in 173 countries and the goal is to bring the world together through the shared connection of reading aloud.
In addition to the read aloud happening at your school, there is also live author events. Attached below is the schedule of authors reading books for your students. On the website, there is also an activity worksheet that includes Clifford and a template to create a Reading Crown.