Save the date
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A save the date notice is an item stating the date of a wedding or other formal event. It typically states the date when a couple plans to marry, so that recipients will know to keep that date free. Save the dates usually take the form of a card, but can also be a refrigerator magnet or similar item. They are generally sent out at least six months before the wedding date, and are usually followed by a formal wedding invitation.
Like wedding invitations themselves, save the date cards follow a broadly-defined etiquette.
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, ranging from wedding anniversaries to grand opening ceremonies for office buildings.