Brain Teaser - The Cocktail Party

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This is a riddle to tease your brain. There was a cocktail party which I attended in Ohio, USA. The guests who were invited were 1,500 in number. The seats provided for guests were 750 in number. Now, what would the guests or celebrants do to make every guest sit comfortably? If you have the answer to this riddle, please post it to MyLot.com