This article details a role-playing "citizenship simulation" used in a large graduate seminar offered by the Masters of International Relations (IR) faculty at Monash University in Melbourne, Australia. While recognizing the need for a more systematic analysis of the relationship between class size and active learning strategies, this article offers an anecdotal reflection on the challenges faced when employing active learning in an IR course with growing enrollment numbers. We describe and analyze a simulation used in the graduate course to evaluate the feasibility and desirability of structuring large IR classrooms to include participatory group activities such as simulations. We also hope the simulation provides instructors with an effective sample design for simulations in their own larger courses.