A wildfire forces the guests to flee the original venue.
If you were thinking of a different show, Season 5 finales often center on major nuptials: [S5E24] The Wedding (Part 2)
The ceremony moves from a country club to a Mexican restaurant, then to Mitch and Cam’s cramped apartment. A wildfire forces the guests to flee the original venue
"Modern Family" The Wedding, Part 2 (TV Episode 2014) - IMDb Other Iconic "Wedding" Finales Discouraged by the endless
In a touching turnaround, Jay Pritchett—who had previously struggled with his son's wedding—steps up to host the ceremony at his private club, finally giving the couple the perfect moment they deserved. Other Iconic "Wedding" Finales
Discouraged by the endless mishaps, the couple briefly considers canceling the wedding, fearing the universe is trying to tell them something.
While several shows have used this title, the most notable titled " The Wedding (Part 2) " is the Modern Family Season 5 finale. Modern Family: The Wedding (Part 2)