Independence Day

Independence Day is the national holiday for the United States. It is held July 4, every year on Earth. July 4 was the date the United States' Declaration of Independence was signed and ratified, hence forth, Independence Day.

Celebration
The normal celebration for Independence Day is that people shoot off fireworks in the air to mark their freedom from King George of Great Britain.

The Martians
According to some Martians, the fireworks symbolize rockets going off and heading towards Mars. Most of them become scared and hide down in caves for a couple of weeks before coming out again.