I think an old fashioned pumpkin carving contest (inspired from Hagrid's pumpkin patch) would have been quite amusing to watch if the students were entirely not allowed to use magic and instead had to utilize regular muggle tools for their creations. It would have been a mess, but nothing that couldn't have been cleaned up quickly with a swish of a wand afterwards.
While the Halloween feast has been characterized with quite a few unpleasant events in previous years like a troll breaking in or a cat being petrified for instance, let's hope this celebration remains as planned!
