Move events to another calendar on Mac
You can have multiple calendars — one for work and another for personal activities, for example. When you move an event to a different calendar, the event’s colour changes to match the new calendar. If you want colour-coded events, such as red mandatory events and yellow optional events, create a calendar for each type of event and move events between the calendars.
In the Calendar app on your Mac, do any of the following:
Double-click or force click the event, then choose a calendar from the coloured square pop-up menu in the top-right corner.
Drag the event to a new calendar in the calendar list. If you don’t see the calendar list on the left, choose View > Show Calendar List.
To move several events at once, Command-click the events to select them, Control-click one of the selected events, then choose Calendar > [calendar].
To copy an event, select the event, then choose Edit > Copy. Select the calendar where you want the event, then choose Edit > Paste.
To move all events from one calendar to another, export one calendar and import it into another.
Note: If you move an event from a calendar that’s not hosted on an Exchange server to a calendar that is, some event information may be saved in the Note field because some options aren’t available in Exchange calendars. See About using Exchange calendars on Mac.