You could also do a crossover with a superhero universe. The superheroes could be invited to the Canterlot wedding as special guests. But then an old villain from their world follows them and tries to ruin the wedding. The ponies and the superheroes would then have to team up to stop the villain and save the day.
One idea could be to crossover with another fantasy world. For example, bringing in characters from a popular high - fantasy series. They could interact with the ponies during the Canterlot wedding, perhaps causing some chaos or misunderstandings. Maybe a character from the other world mistakes the wedding for a coronation and tries to claim the throne.
Another plot idea is to have a time - travel element in the 'a canterlot wedding crossover fanfiction'. A character from the future could come back to the time of the wedding to prevent something bad from happening. This could lead to all sorts of changes in the events of the wedding, like different pairings being formed or secrets being revealed earlier than they should.
A practical answer is Chapter 16, because it turns the idea into a concrete scene. The chapter opens with Just as the words fell, Jiang Shixu swiftly cast his eyes downward., adds pressure through Smelling the pleasant jasmine scent coming from her, his tense nerves..., and ends on Jiang Shixu.
Chapter 73 is the strongest chapter-level answer because it starts from Director Sun, tongue-tied, finally managed to squeeze out a sentence,... and follows through on Despite Wen Jiaojiao's fiery temper, there were still many who were drawn....
A practical answer is Chapter 15, because it turns the idea into a concrete scene. The chapter opens with Jiang Shixu woke up from those nightmares filled with blood and darkness,..., adds pressure through Jiang Shixu's mind was starting to cloud, but for some reason, when he..., and ends on Since.
If you want the clearest chapter reference, go to Chapter 57. Early on, Lu Xingchao's numerous fans were stunned.; later, the chapter leans on Holy shit, what's up with God L?.
The best chapter pointer here is Chapter 50, "Girls Help Girls!". It opens with [666, if good scores determine rankings, is Flash Change's production team... and closes on What kind of heavenly being had such a sour temper and liked dancing....
The best chapter pointer here is Chapter 26, "Sending My Big Brother to a Transformation Variety Show". It opens with Shen Lan was bent over processing a large stack of press briefs on her... and closes on If you think you can use our family connection to have me handle this....
Chapter 17 is the strongest chapter-level answer because it starts from Jiang Li glanced at Jiang Shixu, who was tense and anxious behind her, and... and follows through on I've been a mother for more than ten years but never tasted anything made....
The best chapter pointer here is Chapter 38, "Pretending to be a Top Student? You Must Have Forgotten Your Own College Entrance Exam Score!". It opens with Jiang Li had also observed the girl who had just entered.
Chapter 873, "The Sooner, The Better", is the clearest early answer because it turns Ji Yanbai's situation into a concrete plot event. It opens with Under a curse?!" Wan Jia stood up excitedly. and closes on After closing the livestream, Jiang Li smiled and looked at Wen....
Chapter 19 is the strongest chapter-level answer because it starts from What criminal law is this or that, this was originally none of your... and follows through on Please give me Miss Su's birthdate." Mr..