Sustaining Tourism Enterprises During the COVID-19 Pandemic Act or the STEP Act This bill requires the Department of Commerce to provide grants to certain tourism promotion entities and event venues to address the economic impacts of COVID-19 (i.e., coronavirus disease 2019). Eligible recipients are entities that (1) perform tourism promotion responsibilities; (2) host, organize, own, operate, or staff an event venue, a convention, or a trade show; or (3) provide certain services to events and tourism locations. Grant funds may be used for specified costs associated with tourism marketing and promotion activities designed to assist economic recovery in communities impacted by a decline in travel, tourism, and events due to COVID-19.