Children trick-or-treat during the Charlestown Halloween Parade in Boston, Massachusetts, the United States, on Wednesday. Thousands of revelers jammed the streets of the city for the parade. Halloween falls every year on Oct. 31. It is held the day before All Saints’ Day, which is a Christian festival used to celebrate recognized saints. Halloween activities typically involve trick-or-treating, dressing up in costumes and carving pumpkins.SD-Agencies