Pre Order Banner

Can we add a way to show "pre order only/not available on the day" products PER event? The reason being I am constantly having to update graphics / posts to say which ones are not going to be available per event and yet still get upset readers when they aren't there on the day.
If I'm travelling for a signing, I won't take all of my books (there's just too many) so I need to have certain books as pre order only, but if it's local, I would take a lot more.
Ideas:
Create a checkbox per product on the event form to say which ones are pre order only that will show in a category n the page for the customer Use a banner on the sorting page so we can copy the book to that banner (but keep it in the series as well) so it can be under two banners? Create a check box list of all active events per product on the product page that we can individually check which one is a pre order only Create a option via the event edit page where we can select the products on the listing as "pre order" only.