Check, then revise

Suppose the draft has the right time and place, but forgets "bring one item."

Make the correction concrete:

"Add that each visitor should bring one item. Keep the confirmed time and place, and keep the placeholder for the booking address."

Then compare the new draft with the brief again. Revising one detail can change another.

You can ask the model to list which requirements its draft meets. That can help you inspect the answer, but it is another generated response, not independent evidence.

A clear assignment makes the answer easier to produce and easier to check. It does not make checking unnecessary.