Wednesday is National Margarita Day. It’s a fine excuse to take off early, no? Especially when you consider this: The Blue Goose Cantina will celebrate, all day long (11 a.m.-4 p.m.), with $4 house margaritas.

How did the margarita come to be? Here’s how the Blue Goose folks tell it:

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“There are many historical claims surrounding the tequila infused cocktail, but our favorite originates in 1948 when the Dallas socialite, Margarita Sames, hosted a pool side holiday party at her vacation home in Acapulco, Mexico. Margarita decided to entertain her guests by getting behind the bar and mixing spirits and then asking her party guests test and rate the results. That evening she mixed tequila with Cointreau and lime juice — the concoction was a complete success and it soon made its way to Dallas and rest is history.”