Hi!. I Bought my tickets online for the 15th of August. But can't make it now on that date can I use them for another date?

I don't believe you could? you should try calling the 1800? number on line, hopefully this will help.

You need to call customer service for them to help you schedule another day

Nope

You can call guess relations and they can refund you or see if they can exchange the tickets for the day you would like to come