The biggest party in American sport is about to get even bigger on Sunday when Las Vegas hosts the San Francisco 49ers and Kansas City Chiefs in what promises to be a Super Bowl blockbuster for the ages.The horde of tourists will flock to casinos, nightclubs and celebrity-hosted watch parties being laid on in addition to Las Vegas' regular array of concerts featuring stars such as U2, Adele, Christina Aguilera and Green Day.
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