It depends on the level of the performance to be held. If it's a
really important event, it makes sense to order decorations from
professionals. For the rest, ideas from the Internet will
suffice
I agree, it depends on the event. You need different presentations
for different purposes. Personally, I will soon be preparing a
Halloween story for my little students. For that I have already
found a halloween google slides template on the website https://loveslides.com/halloween/spooky-halloween-free-template-in-sliders-0035.php
and will prepare a little story for them about why we make lanterns
out of pumpkins. I think they will be interested and my
presentation will look like a little book with illustrations, maybe
even add music for the atmosphere.