I still don't know... how do you know when the time is right?
Then you have this big bash and tell everyone.
It be nice if you didn't and later if it totally flopped you could just sneak away.
I think that is one of the reasons why its a big bash! Plus the fact you made this promise in front of everybody and for those who are religist God also.
It be easier to hide the whole thing and break up anytime you want, but I guess that is the point.