The short answer
Cinco de Marcho is an unofficial, made-up U.S. observance on March 5. Timeanddate describes it as a 2007 novelty marking the start of a 12-day countdown to St. Patrick’s Day.
It is not National Cinco de Mayo Day, not a Mexican national holiday, and not evidence of a Mexican-American tradition. The archived page’s origin story and nationwide-phenomenon claim are removed because no reliable support was preserved.
Cinco de Marcho is not Cinco de Mayo
Cinco de Mayo is May 5 and commemorates the Mexican victory over French forces at the Battle of Puebla in 1862. Library of Congress material documents that history. Cinco de Marcho is a wordplay observance on March 5 with a different and much more recent origin.
Keeping that distinction clear preserves the URL’s useful informational intent without treating Mexican history as a drinking-theme prop.
A better way to use the page
Readers looking up the phrase need a clear definition, date, and distinction—not a sales pitch for tequila or hybrid cultural stereotypes. A low-key gathering, themed meal, calendar joke, or alcohol-free drink can acknowledge the novelty without claiming cultural significance it does not have.
This page does not recommend using the date to ‘train’ for heavier drinking.
About hangover claims
NIAAA states that there is no scientifically proven hangover cure and that the only sure way to avoid one is not to drink or to keep alcohol intake to a minimum. Coffee, showers, more alcohol, or novelty ‘training’ do not speed recovery.
Anyone who chooses to drink should be of legal drinking age and should not drive or perform dangerous activities afterward.
What was removed from the archived page
The incorrect National Cinco de Mayo wording, unsupported origin story, nationwide-popularity claim, tequila and beer promotion, raw search links, and culture-mashing suggestions are not part of this sourced explainer.