Here's an interesting fact that may explain why Liz is stressing out over having a big white wedding: she thinks that she has to because Mike and Deanna did. You see, nobody told her that the wedding she attended was a sham and that Mike and Dee were already married. As I remember quite clearly and howtheduck can tell you, nobody took the time to share that secret with her. Reading between the lines gives you the distinct impression that she was, in fact, not meant to know. This lack of awareness had two side effects. The first was that she believed that Elly had a tolerance of co-habitation that she lacked because of noticing how calm Flapandhonk was about Mike and Dee's living arrangements. Liz, you see, WAS the first person to discover that they'd shacked up which led to their getting married in private in case she told tales out of school. She ignorantly assumed that they were single and probably still does. This is because each Patterson thinks that she's in the loop when she's not. This leads to the second problem. Since she doesn't know that Elly cares less about the ceremony surrounding the all-important exchanging of vows, she thinks that she has to shoot the works to impress her. This is why she screams and hollers about trivia; she will never know that she wasn't expected to pull off a Big-Ass Kitsch Abomination Wedding. Elly may like pageantry but she'd forgo it in a heart-beat if it meant that Liz were married.