Officiant
The primary reason Peter and Shannon are together. Peter begrudgingly thanks Chris for his Cupid arrow.
Maid of Honor
Shannon and Liana were randomly assigned as roommates freshman year and the only thing Shannon wrote to Liana before meeting each other was "I'll bring a fan". Thankfully Liana gave Shannon another chance.
Best Man
The shorter, slightly less good looking but arguably smarter Mertens brother. Other than that, they're pretty much the same people.
Maid of Honor
Olivia and Shannon have been preparing for their wedding dance floors ever since they were little, scream singing (Olivia was singing, Shannon was, what could only be called, screaming) and “dancing” (or what we thought was dancing) around Olivia’s basement to ‘Wipe Out’. It’s only fitting that they get to show off their skills at each other’s weddings 3 weeks apart.
Groomsman
Despite Peter's best efforts, he never beat Ed in a three-point contest. Peter would accept one win as a wedding present.
Bridesmaid
Beth is arguably the more crafty one, having knit many things and baked countless GF treats for Shannon, and Shannon is arguably the better consumer of these goods. No one said it was balanced but it works.
Groomsman
Peter and Jake have been known to speak to each other in obscure movie quotes for extended periods of time. Don't ask them if they've seen "Forgetting Sarah Marshall."
Bridesmaid
Kasey tricked Shannon into eating Hot Cheetos and Chili Mangoes when they were 8. Shannon hasn't liked spicy foods since. Shannon kindly requests that Kasey not bring these to the wedding.
Groomsman
Given both their competitive nature, it should come as no surprise that Peter still holds a grudge towards Hans for when he struck Peter out in little league baseball when they were nine.
Bridesmaid
Ellie and Shannon lived in an apartment the size of a closet, surviving mainly off of Thai takeout, while Ellie's room didn't have a real door. It was a true test of friendship that they oddly miss.
Groomsman
Although Peter Maag proved superior to Peter Mertens at most activities in their friendship, Peter Mertens will always have the time the Mertens brothers beat the Maag brothers in basketball in the summer of 2004.
Bridesmaid
Tessa and Shannon have been dealing with separation anxiety since no longer going to school together, working together, or living together. Some might say they spend too much time together. Some might say not enough.
Groomsman
It is rumored that if you stacked the number of Cokes that Zach drank at the Mertens house when hanging out with Peter over the last 20 years, you could circumnavigate the world four times.
Bridesmaid
... while it is rumored that Jess and Shannon hold the world's record for longest phone call, which lasted all four years of high school.