Geographical info is certainly the core and bulk of our content, but I’m not sure if it’s the only content we should map here.
Events may yet belong in a different, as yet to be identified, data store, but for now, I like to experiment with what could be done in our somewhat free for all environment.
@maplemoths - howdy & glad to see you here! 
Welcome to OHM!! @Kovoschiz has added some wise thoughts to consider, but I’d encourage you to read up on past discussions here in the forum (E.g., https://forum.openhistoricalmap.org/t/event-tagging-battlefields-campaigns-explorer-routes/104/4 ) and the wiki, as well as looking at items tagged with event already in OHM.
As for general tagging, in general, I think putting data (e.g. mil, party, recreation, etc.) in the namespace is to be avoided. All data should be put in the value part of a tag (key=value), so a system like event:type=party might be better.