When the parish council are trying to determine a date for the Valentine's Gala, they mention that they cannot hold it on the 17th February because they would "miss Hugo's wedding", and finally decide to hold it on the 14th February.

However, when Hugo does his "item" at the gala, he specifically states "It's a week today until I get married..." but that would put the date of his wedding at the 21st February, not the 17th!