How far in advance should you schedule a meeting?
With too little notice people are already booked, and with too much the meeting becomes something they will rearrange later. The window between the two is narrower than most people assume.
How much notice to give
For an internal meeting with a handful of people, three to five working days is the range that reliably works. It is enough that most calendars still have room and short enough that the thing still feels connected to why you called it.
For anything with people outside your organisation (clients, parents, partners, volunteers), double it. They are not watching your calendar and they have no reason to treat your meeting as urgent, so a week to ten days is realistic.
Why too far out fails
A meeting booked five weeks ahead sits in a part of the calendar that is still mostly empty, so it gets accepted easily. Then the weeks fill in around it, and by the time it arrives it is the least important thing in that day.
That is when the rescheduling starts, and a meeting that has been moved twice tends to lose the people it needed most. If something has to be five weeks out, it usually needs a reminder and a re-confirmation a few days before, which is work you would not have needed at two weeks.
Find a time with a poll
Propose a few slots, share one link and let the group vote. Guests don't need an account.
Notice is not the same as lead time on the decision
Most short-notice meetings come from deciding too late that a meeting was needed, and the late scheduling follows from that.
If something recurs (a monthly review, a quarterly planning session), put the next one in as soon as the current one ends. It costs nothing at that moment, and the next one is never short notice.
When the group is large
Notice and group size interact badly. Four people can usually find a slot inside a week. Ten rarely can, so the meeting either lands three weeks out or displaces something already booked.
This is worth noticing, because it is a signal. If a group cannot meet within a fortnight, either the group is bigger than the meeting needs or the meeting is less important than what is already in those calendars. Both are useful things to learn before you send the invite.
When to propose times and send the invite
Propose times three to five working days out for internal groups, a week to ten days for external ones, and put a close date on the poll so it does not drift.
Then send the calendar invite the moment the time is settled, not later. Meetings get forgotten in the gap between agreeing a time and it appearing in someone's calendar.