We're often asked how to change the meeting organiser on an existing (often recurring) meeting.
Can you assign a new meeting organizer to an existing meeting?
The answer is no, you can't change the meeting organizer. You'll need to cancel the meeting and resend it from the new organizer's account. If the organizer's mailbox was deleted, the meeting can't be cancelled and each invitee will need to delete the meeting from their calendar.
To reduce the chances of needing to do this, limit recurring meetings to a set number of days - 10 occurrences is the default.