Hello.
You are having this JavaScript error at the page:
TypeError: jQuery(...).datepick is not a function[Learn More] client.js:366:9
Because of this, calendar is not showing at the page.
The reason of this error, is because your actual them is loading jQuery library second time at the bottom of the page:
https://intoboholtours.com/wp-content/themes/vw-tour-pro/js/jquery.min%20.js?ver=4.9.8
Please read more about such issues here: https://wpbookingcalendar.com/faq/loading-jquery-twice/
You need to comment or remove the loading of jQuery library second time by your theme. You can do this in functions.php or footer.php file of your theme. For more details, please contact support of your theme.
Thank you.