The portfolio includes the eDelivery Expo, Internet Retailing Conference, Internet Retailing Awards and the Internet Retailing Expo. The latter takes place at the National Exhibition Centre in Birmingham and was sponsored this year by Digital River and Amazon Payments.
Russell Wilcox, chief executive of Clarion Events, said: "These are strong products which serve attractive global markets and communities. I expect this acquisition to play a full part in the growth of our business in coming years.
"This is our first acquisition since our own ownership change in January and we hope this will be the first of many."
Clarion was sold to Providence Equity for more than £200m in January this year.
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