#10. Don’t forget to send invitations.
And do that in advance since calendars around Christmas tend to be pretty full. In your invitation mention the following: event occasion, theme (if chosen), venue address, format of the event, date, start and finish time, and recommended dress code. If there are several options for food you provide, then as an attachment you can also send menus to be chosen by each invitee. Optional is also RSVP button.