Someone really messed up on this one:

Dear Evite Newsletter Subscriber,

Yesterday we mailed a newsletter to our subscribers with incorrect dates for three important Holidays. Please accept our sincerest apologies for these errors and note the following corrections:

Labor Day, September 1st
Rosh Hashanah, September 27th
Yom Kippur, October 6th

In addition, we also wish to apologize for having listed Yom Kippur as one of our “Reasons To Party”. We understand and respect that Yom Kippur is a Day of Atonement, a day to be taken seriously to reflect and fast, and as such, one of the most important Jewish Holidays in the year.

Emphasis mine.