GDG Incheon is a Google Developer Group that organizes various events including HackFairs, hackathons, and DevFests to promote developer technologies. It is led by three main organizers: Jeong Jeong-il, Kim Seok-yong, and Yu Seung-hyeon. In the past, GDG Incheon has held over 100 events with over 1,600 total participants. The group provides guidance on effective event planning, including choosing venues, handling registration, budgeting, securing sponsorship, creating agendas and content, and engaging speakers.