Make one useful decision
How to Record Tentative Plans Without Mistaking Them for Confirmed Ones

A possible date, an unanswered invitation, and a confirmed appointment need different records. Show what remains unknown instead of giving every entry the appearance of certainty.
Name the missing decision
Say whether the date, attendance, or a reply is unresolved. “Tentative” is more useful when it includes what would confirm it. Avoid copying unnecessary private details into a shared planner.
Decide whether time is being held
Consider whether the slot must stay free. Mark multiple candidate dates as candidates and review the others when one becomes definite. Check whether someone needs to be told before removing an entry.
Assign a review opportunity
Choose who checks and when. Use any actual deadline in the original request, not an invented one. Once confirmed, update the time, place, and preparation rather than merely erasing the tentative mark.
An example and a stopping point
A fictional entry reads “Saturday afternoon, possible visit; waiting for venue reply; I will check Thursday.” Once confirmed, replace it with the real arrangement and review the unused candidate dates. Use words or meaningful symbols as well as colour. Explain those symbols to anyone sharing the calendar, and distinguish changing the entry from notifying the other person.
A note for your own situation
Candidate date: Unresolved point: Person and review opportunity: Other entries to update:
Keep this with the paper or digital notes you already use. No additional app is required.
For the related next step, see Night-Before Preparation: What to Pack Now and What to Add in the Morning. Choose the guidance that fits the task actually remaining.