For the Honeymoon
This is not actually a way to get money for the actual wedding--although I suppose you could adapt this idea to fit that purpose--but if you find that you cannot really afford the honeymoon, then this may help you out.
At my parents' wedding, they did a "money dance." They danced with anyone who asked and for my mother, they put money a bag/purse she was carrying and for my father they pinned or taped the money to his suit.
My parents used the money they earned to pay for their entire honeymoon and still had some money left over.