Define the campaign before filling the calendar
Agree on the audience, offer, goal and success measure. A calendar is useful when each item supports that shared direction.
Make feedback reusable
Explain why a draft needs work. A clear brand lesson is more useful than another correction that disappears into a conversation.
Review the final version
Copy, visuals and destinations belong in the same review. Changed content returns to review so an earlier decision is not mistaken for approval of a newer version.