We are American..we have our developed and refined culture, why should we want the added confusion of other, foreign cultures?
Long ago we developed our ideals and holidays etc...Thanksgiving, 4th of July, normalcy in relationships etc. So, whyin blazes would or should we play Cinco de Mayo and other games.
All of our ancestors, as they arrived assimilated into the dominant culture. Sure, we had traditions related to origins..thus we have German festivities, Scottish festivals, Italian fests and Irish fairs, held in reserved locations, or neighborhoods for a single day or such.
Yet, none of these groups insisted that we ALL participate in their specific practices, or make special holidays to observe their particular proclivity..
We don't need forced "multiculturalism"..