A surprise wedding is where the guests (by and large) don’t know they are attending a wedding. They are invited under the guise of another engagement (party, birthday, an actual engagement party etc etc!) and are ‘surprised’ by a Wedding! It is not possible (or legal) for 1 partner to ‘surprise’ the other partner in the couple with a ‘Wedding’. Both parties must be willing and aware of the commitment they are making and have signed the Notice of Intent to Marry form in advance.