The ability to register a marriage after the actual ceremony varies from country to country and even within different regions or states. Generally, marriage registration should be done as soon as possible after the wedding takes place. However, the rules and time limits for registering a marriage can differ significantly.
In some places, there may be a specific time frame within which you must register the marriage, and failing to do so within that time might require additional paperwork or even incur penalties. In other locations, there might not be a strict time limit, and you can register the marriage at any time after the wedding.
To get accurate information regarding the rules and regulations regarding marriage registration in a specific country or region, it's best to consult with the local authorities or a legal professional. They will be able to provide up-to-date information on the requirements and procedures for registering a marriage after a certain period.