blondine45 If you are on a PC or Mac and willing to use mods, TwistedMexi's AllCheats mod might fix that for you. It depends on if the objects are somehow connected to the current but where all the festival objects are all in the zone at the same time, making something unplayable. With testing cheats on, right click on the objects and you should see a destroy option. Clicking it should delete the objects. But if they are objects that the bug put there, then that won't work. And I need to caution you, if you make a mistake and miss the object when you click, you can screw up the save permanently as destroy cannot be undone. So, before you try, you need to make a backup of the save. One thing I don't know is if the mod will work in build mode. I've only used it in live mode. To find the mod, just google TwistedMexi and his site should show at the top of the search list.
Hope this helps.
