Yes. You can substitute Triple Sec for unsweetened orange juice concentrate, however, it has less intensity than the liqueur.
Cinco de Mayo is a holiday celebrated in parts of Mexico and the United States in honour of a military victory in 1862 over the French forces of Napoleon III.
One of the earliest stories of the Margarita suggests it was invented in 1938 by Carlos “Danny” Herrera at his restaurant Rancho La Gloria.