General comments using explorations as an example:
While event:*= prefix may not be needed, there can be some organized formats.
event=exploration(illustrative) : Equivalent toroute=to explain what this is generallyname=Lewis and Clark Expeditionofficial_name=Corps of Discovery Expeditionlabel=Corps of Discovery reaches confluence with the Platte River: I favor using https://wiki.openstreetmap.org/wiki/User:Nadjita/Routes#New_tag_label=* instead of*name=for such descriptive object titles, keeping up with the OSM community standard
For simplicity, and an initial (for wip) or basic (for abstracting) level-of-detail, an existing place= point could be reused as a label to represent the approximate location at that time. This is similar to what’s done in boundary= , despite them being different concepts. Secondarily, this can be used as a sorta “spatial index” to help geocode nested rel if they don’t contain geometry directly, which is a common question and confusion in querying them, as recent as today. It helps with rendering directly as well. No need to always perform clustering, or draw artificial areas.
An event can be considered from the functional (the exploration itself), and physical (the on-the-ground trace, eg camps) aspects. The physical features can be related in the type=event https://www.fortwiki.com/Category:Lewis_&_Clark_Camps