When I taught Elementary Computers, I always tried to allow my students some fun times in the lab around each holiday. I also gave them options so that if they did not celebrate certain holidays, then they could still have fun with their classmates! They loved it!
There are so many fun games online for Halloween that are appropriate for kids and students of all ages. I am including links to many below! If you know of others, feel free to share those as well! Enjoy!