Barney concocts a plan when his father arrives at the hotel; Ted thinks he is being framed when a wedding-related duty gets messed up.

Marshall asks Barney and Ted for help figuring out where Lily went in the middle of the night during their argument.

When an old friend of the gang, Gary Blauman, shows up at the hotel for Robin and Barney's wedding unexpectedly, the seating plan is thrown into disarray.

With only a half an hour left before the wedding, Robin and Barney panic; Lily and Marshall rewrite their wedding vows.