HHN ticket information

[trex]

I am planning on going to HHN for two nights during October.
I noticed on the tickets that there is no date listed, just HHN XI
to be used on date reserved.
How does one know which ticket to use for which date?

 

[WebmasterBarry]

I thought that there was a date on the back.

 

[trex]

I did not notice a date, only the barcode.
Has anyone else seen a date on the HHN tickets?