passions at a wedding

It's not entirely clear to me what this gone-viral video of  Maori haka dance at a wedding is about but it is full of heart. The accompanying story leaves my brain addled and looking for context.

Wikipedia says: "War haka were originally performed by warriors before a battle, proclaiming their strength and prowess in order to intimidate the opposition, but haka are also performed for various reasons: for welcoming distinguished guests, or to acknowledge great achievements, occasions or funerals...."

Oh well, something magnetic on my mind's dinner table.