To word it as an example, consider this:
You are logged out of game asleep IRL, the in game explanation is that your character has gone off to herd sheep in the high paddocks or something
The next village over has come and set fire to a barn and claimed one of your villages sacred places for their own.
They are walking around looking tough and the few weaklings who were at the village have run away to gather the stronger members.
You all get together somewhere nearby, and form a plan to attack the holy place late at night when the invaders are likely to be tired or asleep, so you all disperse to gather your strength for the coming battle, then when the sun is down you regroup and fall upon your foes as a coordinated strike force.
I guess that's kind of scheduled, but not in the "Computer says you will have battle at 7:30pm" way