Anything you want changed, added or fixed — a free-form list for us.
An event is a set of assignments on a layout. Copy the current one for the next Yom Tov; each counts against its own needs column. Finalize locks an event once it has been used: its seats and its layout stay exactly as they were, and a copy made from it gets a layout of its own.
Every save is kept. Restoring makes a new version, so nothing is ever lost.