Signed, Sealed, Delivered.

A critique can go great in the room and still slowly wear down the habit of giving feedback, and the reason usually has nothing to do with the session itself.

Someone raises a point, the design changes a few days later, and their input is nowhere in the explanation of what shifted. Or their point didn't change anything and nobody ever said why.
Left to fill in that blank themselves, people rarely land on "it got fully considered." They land on "why bother next time."

Circling back on what changed is the easy half. Closing the loop on what didn't is the one that actually earns you trust. Anyone can report a win. Saying "we heard this, thought about it, and I'm not doing it because X" is a harder kind of honesty, and it's the one that tells someone their input was heard even when the answer was a “no”.

None of this needs its own meeting. A short message after the session covers most of it.
The harder conversations, the ones where feedback got overruled, always need a real reason attached to the decision, not just the decision itself. "We tested it and it held up worse" says more in six words than a week of silence does.

The moral of this story is simple: show people what happened to their feedback, and they keep showing up ready to give more.