Castle and Beckett only need each other at their wedding…and their parents, Alexis, Ryan, Esposito, Lanie and the list goes on and on.
Just wait until they have to figure out who will sit next to whom.
Rick and Kate continued on their wedding planning journey in Castle Season 6 Episode 19 and there's certainly a lot to get done. They don't have venue. They don't really have a date. They don't have a final guest list. About all they just have is the agreement to get married and a hideous dress.