Deactivate Form Element

It would be great if elements can simply be deactivated.
I have an order form, where dates like April, May and June dates are availiable.
If someone orders in June, of course April and May should be not possible to choose from.
The element can be there and visible but no qty of the dropdown element should be possible.
Right now I delete the drop down options, but it is a pain in the neck to fill them in for the next year (for 15 drop downs with 10 options each)
Is there a solution for that?

thanks a lot
micha

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