Just make all the arrangements for your beautiful wedding. Your marriage will not be legal unless registered. This is a common procedure, which must be followed by everyone. Find out how you can get a marriage certificate before and after the ceremony. It is a rule that all marriages must be registered if you have a wedding ceremony or not.
If a marriage is not registered, it is not considered valid during legal proceedings, such as a joint mortgage application. You could even be fined for failing to register your marriage.
A marriage certificate is important proof, in case there are problems between you and your spouse in the future and legal action must be taken.