Charles, I have to completely disagree with you. This may me a Mexican holiday, but the school is not in Mexico. Where are we as a society when students are told they can wear shirts with American flags only on certain days? Are we that PC? Cinco de Mayo is a Mexican heritage day, and it should be celebrated and those of Mexican descent should be proud. That being said, when we get to the point where we’re telling American students that they cannot wear shirts with American flags to an American school on a given day, we’ve got problems.