Final answer:
Americans go trick-or-treating on October 31st, which is a part of the Halloween festivities where people dress up in costumes and collect candy.
Step-by-step explanation:
Americans go trick-or-treating in the month of October. This tradition is part of the Halloween celebration that takes place annually on October 31st. During Halloween, children and adults dress in costumes and go door-to-door in their neighborhoods saying "trick or treat" to receive candy and treats from their neighbors. It's a fun event that includes not just trick-or-treating but also carving pumpkins, visiting haunted houses, and attending costume parties.