Calendars with Public Holidays in LeaveWizard need to be either imported from a template or added manually.
To import a template with public holidays please go to the Administration | Public Holidays and create a new calendar at which time from the Base Template drop down select the template you'd like to use - e.g. UK 2015.
Note that a Public Holidays Calendar in LeaveWizard is applicable either to the entire organisation or only to a specific location.
Click Save and the template Public Holidays calendar will be imported into your new calendar and Public Holidays will now show on your LeaveWizard calendars.