In their presentation To Open or Not to Open, Dr. Christina Edholm (Scripps), Dr. Maryann Hohn (Pomona), and Dr. Ami Radunskaya (Pomona) present a model of COVID-19 spread consisting of several interconnected modified SEIR differential equations to investigate the dynamics between different populations at the 5Cs and the influence of mitigation techniques such as students adhering to health protocols and contact tracing. They also present an app which allows the user to vary model parameters, providing intuition and guidance on campus openings under a range of conditions.