12/13/14
A similar combination like tomorrows date will not return for some time and I don't know if anyone will be willing to hang around and celebrate it.
Saturday's Dec. 13, 2014, represents the last sequential calendar date for at least 20 years January 2, 2034 and another 89 years if waiting for January 2, 2103.
If you're set on commemorating 12/13/14, try to stay healthy for another 100 years somewhere on earth to be able to reach it December 13, 2114. For numbers fans, it's 1,000 years till 3014.