The Global Graph Celebration Day is an initiative to encourage people around the world to participate in graph-related activities, particularly those related to Neo4j and graph databases. The event aims to help the world understand the value of graphs and celebrate the contributions of Leonhard Euler, a Swiss mathematician who made significant discoveries in graph theory. Participants can host local events or gatherings with friends and colleagues, which will be included in a community map and build upon a Neo4j community graph. Exclusive t-shirts and swag will be provided to event organizers with 12+ RSVPs. The event is scheduled for April 15, 2019, and registration is now closed, but interested individuals can sign up for next year's event.