Officially Random Acts of Kindness Day is an unofficial holiday. The banks don't close, picnics are rarely planned, and there's no flag commemorating the day.
However, it's celebrated across the world as a time to do something for someone for no reason. Ideas to celebrate the day are all around. And various events take place, mostly through local organizations, events and efforts. It's really common in schools. It's a day set aside to focus specifically on being kind. The goal of the one-day focus is to encourage people to engage in acts of kindness all the time.