Yes, Wappler had a single date picker and a date range picker with lots of formatting and customisation options like custom date ranges, It would be fairly straightforward to customise the date picker based on a specific tour so each tour could have its own date range. Just would need a few database settings.
Availability is just down to you doing some simple validation at database level.
To see the date picker and range picker in action see videos below
Date Picker
Range Picker