Have children sit in a circle around the pumpkin. They should be far enough away they it becomes necessary for them to stand up to reach the pumpkin. The game is played in a manner similar to Duck, Duck, Goose, where one child walks around the circle lightly tapping each child on the head. You can make up what you want the words to be. Perhaps, "Trick, Trick, Trick, Treat!" When the child says "Treat" the child whose head is tapped runs into the circle and retrieves one piece of candy off the pumpkin. Meanwhile, the other child must run around the circle and attempt to take the empty spot before the other child returns to his spot. Whoever is left out of the circle is "It" and continues the game tapping, "Trick, Trick, Treat!" Continue until all the candy is gone.
Or make up your own rules.
Or just use the candy-covered pumpkin as a centerpiece.
Or let your trick-or-treaters choose their own piece of candy from the pumpkin.
I'm sure you can think of other uses for this very easy-to-prepare candied pumpkin. Kids will love to help stick the candy on the pumpkin too. And not only that. The pumpkin is re-usable!