Other names/scopes I considered include wargaming and scenario planning.
I think tabletop exercises is better than wargaming because I think they're roughly synonymous but the latter has highly militaristic/adversarial framings, which seem important to avoid in some contexts, including with respect to some/many existential risks.
I think scenario planning is either a much larger category or just a distinct but related concept, so it seems best to have an entry/tag for tabletop exercises in particular. But perhaps we should also have one for scenario planning.
Maybe the name should be tabletop exercise, to be in accordance with standard naming conventions on the Forum?