Leonhard Euler is a prolific mathematician whose work has had a significant impact on various fields including graph theory, calculus, differential geometry, number theory, and infinite series. His solution to the Königsberg bridge problem in 1735 laid the foundation for modern graph theory, which is now ubiquitous in technology and everyday life. To celebrate Euler's birthday, the Neo4j community comes together online for a Global Graph Celebration Day Meetup, where they share their knowledge, discuss the history of graphs, and engage with fellow enthusiasts. The event also features an announcement related to the GraphQL community and a Leonhard Euler Idea Contest, which invites developers to transform their ideas into reality using Neo4j's graph database and GraphQL library, with $10,000 in prizes at stake.