Get ready, get set, now change. This issue presents the 10^th anniversary edition of our list of the 50 top event companies — the biggest event planning companies by annual revenue — who all told add up to nearly $1.7 billion in revenue.

Over the past year, they have been added capabilities — largely social media and event measurement tools — to better deliver effective events for clients.

And clients seem to be pleased; our 50 Top predict event revenue will grow by 9 percent on average this year over last.

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