A Surprise wedding is such a wonderful gift to give your guests at your supposed function. Your guests are expecting an engagement party, birthday or anniversary party, housewarming or some other gathering and suddenly "It is a wedding!"
All you need is one witness each and comply with the 30 day Notice of Intent to Marry regulation of the marriage act of 1961.
I can supply the form (NOIM) for you to fill in or you can download the form from Births, deaths, and marriages site.
The surprise is for your guests and not for your intended.
I make everything happen ceremony wise and double as your MC or toast person before announcing your wedding... so much fun!!