Hi Glenn,
Thank you for reaching out to us!
It’s not possible to achieve what you want out-of-the-box, but as a workaround, you can create the more expensive “day-of-the-show” ticket with the sales starting today, but with it’s individual capacity set to zero.
You can then hide the “Out of stock!” message that automatically shows up on the front-end of the site via CSS and update it’s capacity with the correct number only on the day of the event, allowing users to purchase it.
I hope this helps! If you have any other questions at all please feel free to let me know and I’d be happy to help as best I can!
Cheers,
Patricia