Is it possible to display reservable dates in a calendar view?

(3) Finally, we are wondering if the reservable dates can be displayed in a calendar view.

Yes, you can indeed display a calendar report from a form submissions, please check this guide that will help you to do that: https://www.jotform.com/help/249-How-to-Create-a-Calendar-Report

If you have any question, please let us know.