Record the change without erasing the earlier visit
When a location changes between sessions, update what you need to run now and preserve when the old information was true. DMGrid connects preparation through a world map, location details and session notes. The chronology suggested here is manual writing, not an automatic world update.
The official DMGrid facts page describes the campaign archive, map, locations and formatted notes. It does not promise that changing one detail rewrites other notes or alerts every player.
An open bridge and a later change
Fictional example: in session four the party crossed the mill bridge. Later, in your preparation, a flood closed it. When they return, two facts belong to different moments:
- Session-four record: the party crossed the bridge and spoke to the miller.
- Prepared session-five state: the bridge is closed after the flood.
- Party knowledge: what they discovered in session four until they encounter the change in play.
- GM preparation: how they might discover it and which alternatives exist, without choosing for them.
The later state does not make their earlier crossing a mistake. Do not change the summary to “they could not cross” if that was not played. Nor should characters automatically know of the flood because you have written it down.
Prepare the place with a recognizable reference
In the location details, write a current-state note using the session or fictional-time reference you follow. Keep the past event in session notes. When describing a future scene, separate prepared possibilities from actions the party actually chooses.
A suggested note: “Session-five preparation: bridge closed by a flood after the session-four crossing. The party has not seen the change yet.” This is original editorial text, not a Timeline field or new DMGrid rule.
Review what you share before displaying a map or information at the table. Having a location in your archive does not require revealing all its private notes. The player-summary guide helps prepare that part.
Local preparation for your next session
DMGrid is a Windows beta for in-person campaigns on one computer, with local data and offline use. It does not provide browser multiplayer rooms. Visit DMGrid for current licensing, offer and downloads. Before the next session, answer two separate questions: what the party experienced and what changed afterwards.