Two people can each have a workable week that becomes impossible when their plans are combined. A late meeting overlaps with a collection time, or both assume the other will be home for a delivery.
Spend a few minutes looking at the coming week's fixed commitments together. Identify shared responsibilities and name who will handle each one. Add travel time where it affects a handover. A calendar entry marked school meeting does not say who is attending or how collection will happen afterwards.
Resolve the awkward overlap
Choose the collision most likely to cause trouble and discuss the available options. One person may be able to move a call; another commitment may be fixed. Make the arrangement explicit instead of leaving it as a tentative assumption.
If plans change, update the calendar and tell the person affected. Agree which kinds of changes need a direct message. A shared calendar helps keep information available, but a new entry is easy to miss when someone is relying on yesterday's plan. Keep the weekly check short enough that you can repeat it.
