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How to show a dates select list at checkout?

I have searched a lot for the following question, but I did not manage to find an answer. So...

I have a "training" product, that is available on certain dates.
The dates are declared in a multi-value date field (provided by the date module), and are shown to the user in a calendar widget (provided by the calendar module).
I want the user to be forced to select the date that he is interested in, during the checkout process, from a pre-populated select list of available dates (that will be drawn from the product's date field).

How can I build that select list and include it in the checkout process?

Thanks a lot, in advance, to all the community.

on July 14, 2016