
The rise in Cinco de Mayo's popularity in the United States can be attributed to the Chicano student movement of the late 1960s. Inspired by student-activists nationwide, members of the MEChA organization in California sought to find a day of celebration that highlighted their largely Mexican ancestry.
Over the years this holiday grew outside university circles and its activist roots, and was absorbed by mainstream culture in the Southwest United States and beyond. For many international Mexican communities Cinco de Mayo is an important way to proudly honor their Mexican heritage.
Non-Mexicans also participate in the celebrations, much in the same manner that non-Irish people observe St. Patrick's Day, with holiday-themed parties marked by the consumption of Mexican food, tequila and Mexican beer.
Above text borrowed from Cinco de Mayo - Wikipedia
Any of the Mexican Restaurants in Munich will be having specials on Thursday and will likely be very lively.
See also last year's AiM Cinco de Mayo party at Tacos y Tequila including pics by Keydeck.
