How do you celebrate your holidays? The Wikipedia entry for Memorial Day begins with the following description.
Memorial Day is a federal holiday in the United States for remembering the people who died while serving in the country’s armed forces… It typically marks the start of the summer vacation season, while Labor Day marks its end.
Many people visit cemeteries and memorials, particularly to honor those who have died in military service. Many volunteers place an American flag on each grave in national cemeteries.