Hi Julie,
Unfortunately there is not currently a way to do this out of the box. I did a quick search and found some third-party plugins that will let you automatically increase the price for a product based on the stock (such as this one from WooCommerce), but not the date. I think your simplest solution would be to change the price manually on the same ticket, or you could also do a customization to get it to change automatically. If you’d like to go this route, our themer’s guide is the place to start!
I can see how this would be a useful feature – would you mind posting this as a feature request over in our Feature Ideas Forum? This is what we use to gauge user interest in new features and help guide future development efforts.
I’m sorry I don’t have a better answer for you, but please let me know if you have any questions!
Thanks,
Jennifer