Wedding Band Covers CONVERGE At Reception

So this band Kallaqri (I think that's their name) totally cover Coverge's "Concubine" at a wedding reception, and people are into it big time! I'm confused on a few levels by this video; did the bride and groom request the song? What the hell prompted the cover? Why does the bass player keep falling down and eventually just take it off to mosh? Was this filmed with a potato? So many questions left unanswered… but we can confidently say that one time Converge was played at a wedding, and everyone was really into it. Thanks, Internet!