I think you will still need the JP? Because he has to sign on your marriage certificate. You might need to start preparing asap, because you need to do a lot of research before finalising on which vendor you want and it will take up a lot of time.
Probably you need to find AD and pre wed photography and videography if it's not included in your bridal package. Vendors for services like photo booth or decorating the venues. Most importantly is Justice of Peace, which you need to start finding 6 months before your wedding date, as popular JP...