Last February 3, 000 mexicans were scheduled to show up at a convention hall in the city of Monterrey for a free, one-time health clinic called Tour de la Vida.

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Witness to that are the arcade's dark blue carpet (salvaged from a Vegas convention hall), mismatched ceiling tiles and a change machine that Arnold scavenged from a dumpster behind the Golden Nugget casino.

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On a recent morning Alexei Miller, head of Russia's OAO Gazprom, the world's largest public energy company by reserves, strode toward a lectern in a standing-room-only convention hall in Amsterdam.

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It was a gesture that moved many in the convention hall to tears.

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So the most innovative stuff I saw in Las Vegas this week were at a "hackathon" at Las Vegas' Palms hotel, a couple of miles from the main convention hall.

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The Democratic National Convention in Chicago resulted in what was called a police riot and the violence outside the hall was debated on the convention floor.

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Organizers converted the convention center's massive, bare-bones exhibit hall into a slightly less bare-bones ballroom.

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At the Greater Columbus Convention Center, that Friday morning, the main hall felt like a circus tent.

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It includes a new convention centre and indoor arena with four potential sites: the current County Hall site in Cardiff Bay, the Red Dragon cinema complex nearby, the site of the Brains brewery and Callaghan Square, which are both situated close to Cardiff's central railway station.

BBC: South East Wales