I think the wedding with be Rumple marrying Belle. There were spoiler pics of Mr. Gold’s pawnshop decorated with pink and white steamers, suggesting Belle decorated it for her own wedding. Who else besides Rumbelle would get married in a pawn shop? No one.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy