This can be a roomful of hay (or shredded paper, paper leaves, anything) with small objects hidden, or more like a bin as pictured. Trick-or-treat baskets or pumpkins would be cute too.
Maybe set up for next year! best-classroom-party-game-pumpkin-golf-kids-love-it
Instead of pumpkin carving, try pumpkin painting!
DIY Photo Booth for a Harvest Party-pumpkin and scarecrow