Denim Day is a campaign to prevent sexual violence through education and public awareness. April is Sexual Assault Awareness Month, and Denim Day is a call to action for all people to come together by wearing denim as a visible sign of protest against sexual violence. Denim Day is a campaign to prevent sexual violence through education and public awareness. April is Sexual Assault Awareness Month, and Denim Day is a call to action for all people to come together by wearing denim as a visible sign of protest against sexual violence.