No matter how good you plan, there will always be things that go different.
Campaign costs are higher then expected, staff getting sick, demand plunges etc.
And then you need to adjust, in Value Through Passion's framework we call this ReSet.
If you work with a team, resetting will be done with the help of meetings.
I prefer to have meetings on a weekly basis for a team but if your organisation feels more comfortable with biweekly or monthly that is good too.