It'd be truly amusing if the episode was about Seymour trying so hard to prevent Agnes from causing any trouble that he just forgets about the wedding entirely, all while Agnes is at some insanely long poker tourney.
It is obvious that Agnes would do something like that, so I wonder if the writers would surprise us all by letting Edna and Seymour go through with the wedding.
Agnes: It's about time you got married and moved out, you Mama's boy!
Seymour: Mother!