Why was the wedding such a success?

District 2 is now in the rebels' hands, leaving the Capitol completely cut off from the rest of Panem and all of its resources (just as District 13 was after the Dark Days). Plutarch explains that unlike the citizens of District 13, though, the inhabitants of the Capitol are not used to hardship. He also tells Katniss that Finnick and Annie are about to be married in a grand televised event to raise the rebels' spirits. Ultimately, the wedding is a "smash hit" (226) and everyone is genuinely happy for Finnick and Annie. There is a big dance party in District 13 that night - even Katniss joins in, sharing a dance with Prim. When the wedding cake comes out, Katniss recognizes the intricate frosting decoration - only Peeta could have done it.