Because it’s highly likely that The Big Mac Question means Sugarmac wedding, this is who I guess are gonna be the positions (with Big Mac and Sugar Belle’s positions given facts).
Mayor Mare always officiates the weddings, but Twilight is a possibility.
Applejack could be in charge of planning the wedding - giving her a BIG responsibility for making sure her brother’s wedding is perfect! Since she didn’t have her second episode this season yet, I got the feeling she’ll be playing the leading role in the episode!
For the Bridesmaids, I chose Night Glider cause she’s basically Sugar Belle’s closest female friend, Marble Pie cause perhaps maybe Sugar Belle knew how upset she was since she had a thing for him so she wanted to make it up to her, and Starlight but I’m sure she wouldn’t be comfortable given by their past. I dunno who should be the Mare of Honor though – so I’ll let you guys and gals pick! ;)
Spike of course should be the Best Man because he and Big Mac are implied to be the best of friends judging by how much time they spend together on Guy’s Night – plus we don’t see enough of their friendship in the series! There’s a possibility of Discord being jealous though!
The Ponytones would be in charge of the music, since this is Big Mac’s big episode, it might be great showing all of his accomplishments and references to all his past episodes in here!
I thought Ocellus would make a good ring bearer since in A Horse Shoe-In, Ocellus was impressed with Big Mac’s sewing skills, and I thought maybe Ocellus would see Big Mac as a personal mentor! That would be pretty cute, and giving Big Mac a personal student would be really nice to see!
I thought the Tree that the Apple parents made would be the perfect spot for them to get married, because I’m sure Big Mac would want his parents to be there for the wedding! Oh the feels, Applegeek would lose it! XD