Okay another construcion paper one.
Have the kids help make a banner for your classroom (and maybe another for the school hall——depending on how many kids are in your room)
I’d do it in yellow & orange and hang it w/orange or black yarn.
Each student decorates one panel on the “Happy Halloween!” banner…meaning one kid does H, one the exclamation point, along the line. (the paper doesn’t get cut, so the letter should be big)
Now for Thanksgiving, I like these done with seeds/pine cones——all nature/free fromoutside items.
For Halloween, you could go that route, or you could go the way of plastic spiders, pumpkin sequins-etc, or you could go with pumpkin seeds/sunflower seeds-etc.