Panel 2: Well, that's a wedding for you. Scheduling any big event is time-consuming and complicated. I think "hassle" is a bit of an overstatement, if Dawn is referring simply to scheduling conflicts and the like. I think Beverly Cleary said it best. "A wedding can't be perfect. It involves people."
Panel 3: Oh, so it is MOB from hell. Of course: it can't be just the normal confusion of, say, Phil and Georgia's wedding. Someone has to be the undisputed bad guy. Christ on a cracker, can't we at least have the conflict be something serious, like crossing race or faith lines?
Panel 4: Oh, it's coming.
Panel 5: Yep, what I thought. And Liz thinks it's soooooo hilarious.