Try this
- Name which part of the event you want to revisit and ask whether that feels comfortable.
- If the unresolved issue is actually your reason for bringing it up, state that directly and choose a conversation format suited to it.
A worked example
“I want to remember the walk itself, but I know the travel disagreement is part of that day too. Would you rather leave the photos for now?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Do not use nostalgia as an indirect route into a conversation someone declined. Either purpose can be discussed honestly without disguising it as the other.