Main menus from old events

It took me almost a year to realise but do the main menu backgrounds from old events dissapear once the event is over? I only have the one from the current event but all the previous ones are gone, all the other mods are there but not the menus.

Some of them can be found as mods.

You get them all saved as mods, and can turn it on in the mod manager. Just search for it if you can’t find it downloaded.

Where do I search them? They are not on the mod manager or the mods folder