Labor Day, the first Monday in September, is a United States federal holiday and is dedicated to the social and economic achievements of American workers. Labor Day marks the end of summer vacation and is also regarded as a day of rest...picnic...barbecues...firework displays...water activities.So get set to work real hard and chilling out with your friends and family by sending these Labor Day Cards and free Labor Day Cards. All Labor Day Cards, Free Labor Day Cards, Labor Day E Cards and Laor Day Greetings are absolutely free!!!