Take the bag of treats to Linus and Sally in the pumpkin patch. This is essentially the end of the quest, as Sally will leave and Lucy will bring you the Island Medallion.
It never does. You complete the island by bringing your trick-or-treat candy to Sally in the pumpkin patch. (see the related question)
After you have collected the Trick or treat candy, take it to the pumpkin patch and give it to Sally. After Snoopy appears and Sally leaves, you will fade to later that night and Lucy will give you the Island Medallion.
You give it to Sally in the pumpkin patch. She missed trick-or-treating.
You have to go to the pumpkin patch and talk to the boy you have to help him pick the heavest pumpkin for his sister the you have to help him get it home without breaking it then you go in the house and talk to him again and he will give you the bag.
You get the candy on Great Pumpkin island, after going trick or treating.
After you have collected the Trick or treat candy, take it to the pumpkin patch and give it to Sally. After Snoopy appears, and Sally leaves, you will fade to later that night and Lucy will give you the Island Medallion. (see related solution question below)
When Linus gives you his trick-or-treat bag, go outside and give it to Pigpen. He will give you a lemon sucker, which you give to Linus and get his invitation to the party.
Sally misses the Trick or Treat because she is with Linus in the pumpkin patch. After you bring her a bag of candy, she leaves. Violet is one of the trick-or-treaters, along with Lucy, Pigpen, and Charlie Brown. Neither is present at the very end of the quest.
Once you finish trick-or-treating, take the candy to the pumpkin patch and give it to Sally.
The character Pigpen is always shown covered with dirt. He stands outside Violet's house (to the right of Linus and Lucy's house). When you have retrieved a pumpkin and received a trick-or-treat bag from Linus, give the bag to Pigpen.
After you have collected the Trick or treat candy, take it to the pumpkin patch and give it to Sally. After Snoopy appears, and Sally leaves, you will fade to later that night and Lucy will give you the Island Medallion. (see related solution question below)
You get the "trick or treat basket" from the scarecrow in the pumpkin patch after you help him.