Freeze the approved content
Do not begin final output while facts are still moving. Confirm issue masthead and date, lead story, short news items, dates or notices and contact and next-issue information and record the approved revision. Event calendars, contact panels and issue metadata need a repeatable format and a named owner for checking.. Run spelling, design and accessibility reviews, then save the editable .mpub before creating a PDF. A later correction needs a new proof; editing after approval without repeating review breaks the audit trail.