Rosh Hashanah--the Jewish New Year, falls on the Hebrew calendar dates of 1 and 2 Tishrei. Here are the coinciding secular dates for the upcoming year (no cards at this time)
2013: September 4 (at sundown) - 6
2014: September 24 (at sundown) - 26
2015: September 13 (at sundown) - 15
Note: The Jewish calendar date begins at sundown of the night beforehand. Thus all holiday observances begin at sundown on the secular dates listed, with the following day being the first full day of the holiday. (Thus, the first Passover seder is held on the evening of the first date listed.) Jewish calendar dates conclude at nightfall.