How to Disable / Hide certain checkboxes in Contact Form 7 with a certain condition?

I made a simple Form with ContactForm7, where the user can choose between differen dates. Each date has its own exclusiv checkbox.

Now i want the checkboxes to be disabled or hidden if the current date or sys date is past that date.

E.g. the user can choose between:

• 10.10.2016
• 11.11.2016
• 12.12.2016

Today is the 4.Nov 2016 so the available checkboxes should look like this

• 11.11.2016
• 12.12.2016

I hope the problem is clear and thanks in advance