80th Conference On Glass Problems (GPC) Hosted October 28-31, 2019 at the Greater Columbus Convention Center. The 79th Conference on Glass Problems is the largest glass manufacturing conference in North America, attracting glass manufacturers and suppliers worldwide to exchange innovations and solutions. The conference provides 35 hours of technical education through expert lectures, panel discussions, and focused courses on topics, including glass melting, refractories, process control, emissions, and raw materials. Detailed Program and Registration Information