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.
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.
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