If you were thinking of a different show, Season 5 finales often center on major nuptials:
"Modern Family" The Wedding, Part 2 (TV Episode 2014) - IMDb [S5E24] The Wedding (Part 2)
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 If you were thinking of a different show,