You can open the calendars management panel by clicking the calendar panel icon placed in the header bar of the plugin from the forms list panel :
From the calendars panel, you can freely manage your calendars, events, categories and reminders.
Select the wanted calendar from the calendar drop-down then simply click a date to add a new event .
You can manage the categories of events by clicking the label icon in the top menu of the calendars panel:
You can manage the default email reminders that will be applied to the new events by clicking the bell icon in the top menu:
You can also manage the available days of week and hours by the same way.
When you edit a datepicker item, you can assign it a calendar and choose to register a new event when an order is placed.
You can also define the event duration and its category.