Here is a small compilation of events I could find for Cinco De Mayo in various cities/States.
If you find some you want to add please add them...
The holiday of Cinco De Mayo, The 5th Of May, commemorates the victory of the Mexican militia over the French army at The Battle Of Puebla in 1862. It is primarily a regional holiday celebrated in the Mexican state capital city of Puebla and throughout the state of Puebla, with some limited recognition in other parts of Mexico, and especially in U.S. cities with a significant Mexican population. It is not, as many people think, Mexico's Independence Day, which is actually September 16.
Cinco de Mayo block party at Green Lake Tacos Guaymas - http://blog.seattlepi.com/ingr.....203643.asp
Calistoga Tamale Festival — Noon-4 p.m. May 1. Calistoga's best tamale will be crowned during the first Tamale Festival, as part of the Napa Valley town's colorful weekend festivities that include the Calistoga Cinco de Mayo Parade & Festival, live music, food vendors, a tamale contest, a dance, children's art, a raffle, and much more. Proceeds will benefit the Calistoga Family Center and Casa de la Cultura, two nonprofit organizations that serve the community's families and children. Free admission; food and crafts available for purchase. Napa Valley Cinco de Mayo 2010 May 2 festivities begin at noon with a parade through town, starting at Lincoln Avenue at Cedar Street. The one-hour parade is a blend of Mexican and American traditions, with decorated floats and vehicles, bands, costumes, clubs and organizations marching, Aztec and Brazilian dancers, and more. Following the parade is a festival at Calistoga's Napa County Fairgrounds with Mexican food, a children's singing competition, a children's activities area, a deejay for teenagers' dancing enjoyment, craft vendors and services booths. $5 admission; children 12 and under are free. 707-942-6206, www.calistogavisitors.com
The 23rd Annual 2010 Cinco De Mayo “Celebrate Culture” Festival in Colorado - http://www.lavozcolorado.com/news.php?nid=4796
Party up Wednesday for Cinco de Mayo with $1 tacos at KeyLime Cove in Gurnee. Enjoy a fiesta in your mouth with Cove-made flour tortillas, shredded Sonoran beef, pork carnitas, adobo chicken breast, tortilla chips and more. Adults can enjoy the margarita bar as well.
KeyLime Cove is at 1700 Nations Drive in Gurnee, IL Call (224) 656-8685 or visit keylimecove.com.
Cinco De Mayo Fiesta in Los Angeles, CA: http://www.worldeventsguide.co.....-Mayo.html
Festivities in AZ - http://phoenix.about.com/od/ev.....demayo.htm