Part of your planning process should include identifying ways that things can go wrong. Rank your identified risks by their likelihood and impact. The likelihood refers to the probability of risks actually happening, while impact is the consequences if a potential risk happens.
See also: Risk mitigation
Citation: Center for Scientific Collaboration and Community Engagement. (2022) CSCCE Glossary: Virtual Events. Pratt, Woodley, Ainsworth, Carter, Crall, Elkins, Gauthier, Ihle, Kornahrens, Martinic, Santistevan, Shaikh, Sidik, and Wyatt doi: 10.5281/zenodo.6608609