Typical event type save the date for a gala
A save the date is a notice stating the date of a significant event such as a wedding. It is typically sent to those likely to be interested or affected by the event and states the planned date of the occasion so that recipients who wish to attend know to keep that date free.
For weddings, save the dates usually take the form of a card. They are generally sent out at least six to twelve months before the wedding date, and are usually followed by a formal wedding invitation. While save the date started as a wedding-related custom, it is now used by individuals, businesses, and organizations to announce the date of any formal event.