A pot kept warm is hospitality extended into an uncertain arrival time.

Keeping a pot warm is hospitality that does not require the guest to be punctual. It says come when you can, and it absorbs the uncertainty rather than passing it back as pressure. The care is in the accommodation as much as in the food.

There are versions of this everywhere. Making it easy for someone to arrive late, to change plans, to be uncertain, without any cost to them. If you want someone to actually come, remove the requirement that they be organised. And notice who does this for you, since it is a quiet and reliable indicator of the people who want your presence more than your compliance.