I miss them too and think having decorated courtyards generated a lot of hype for events.

But sadly I don’t think this is something we’re able to do for the time being. The reason is that with revelius, the castle is a lot more full. There are npcs all over the place and
many different blocks have functions when clicked. This makes it a lot more complicated to paste things in compared to when the castle was emptier. Though the courtyard itself doesn’t have much in it, all of the surrounding area does. So though I would be happy to see these come back at some point, I hope for now that we can make up for the lack of courtyard decorations by having the events take place at cool builds like Haunted Hollow, Mahounoshiro, and the newly updated Enchanted Valley.