We are pleased to announce the fifth annual International Conference on Game Jams, Hackathons, and Game Creation Events (ICGJ 2020). ICGJ is an interdisciplinary conference for educators, researchers, professionals, and event organizers across various fields related to game jams and hackathons. This one-day conference will be hosted in Osaka, Japan at Kindai University. This conference builds on expanding number of conferences, workshops series and research evaluating, enhancing, and improving game creation events. The previous conference proceedings have been published in the ACM Digital Library, the same is expected for 2020.