In this example, the school wants to apply a theme day on Monday 1st August for a school trip for the Butterfly and Caspian classes so that the students in those classes can select a meal from the new menu that are allergen and diet type safe.
This article will teach you...
How to assign a theme day to a specific student templates.
Go to Menus > Sites > select a Site  > click Student Template  to expand the collapsed menu > click on relevant Student Template (e.g. Gluten free Menus)
In the Month View calendar you will see the week’s menu in the Menu column .
Click, drag, and drop a Theme Day menu from the Theme Days list  onto a date in the Calendar .
Once a Theme Day menu has been added to the calendar the Add Class Override window will automatically open.
The Edit Class Override can be opened by clicking the Theme Day menu that has been applied in the calendar.
In the Add Class Override window the Checkboxes  are all selected by default. If this selection is not changed, the Theme Day menu will be applied to all students across the whole site who have the selected student template assigned. Un-select the Checkboxes for the classes that will not need the Theme Day menu.
Use either the Select/Deselect All checkbox  to unselect all classes and tick the relevant classes the menu should apply to or untick specific classes the menu should not apply to.
When you have made the necessary changes in the Class Override table click the OK  button.