How can I get the date of a Mexican holiday corrected on my Group calendar?

Miercoles de Ceniza (Mexico) is listed as a holiday on June 2, 2008. This is actually ASH WEDNESDAY and has already occurred. How do I get SOMEONE at Yahoo to correct this? I have sent various emails as moderator, but no one seems able to correct this.

moekittykitty2008-02-10T14:23:32Z

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I have seen several YA questions about group calendar problems. I have been trying to make changes in our group calendar for a few months without success. Am currently working with a Yahoo staff member to see if this problem can be resolved. Perhaps if enough group owners/moderators complained about this to Yahoo staff, it might get fixed. Here is link to Yahoo Help Form:
http://help.yahoo.com/l/us/yahoo/groups/original/general.html