Kinda where I ended my thought - though maybe a walk-through lights display kind of like the one at the Oceanfront timed to music or at least on-theme to the playlist?
I expect they could enforce distancing enough to run the lights show outside of Festhaus, given that you can see it from so many angles in that area, if they really want to say they have a show and don’t want to deal with blocking off seats at the Royal Palace.