The Net Media 2004 conference had been planned for 1 and 2 July in Amsterdam, but an alternative venue cannot be found in time, Net Media director Milverton Wallace told dotJournalism.
"The conference isn't totally dead, but this is a serious setback," said Mr Wallace.
"If the event was in October or November, we would have had time to source a new venue. But there just aren't many venues with the IT infrastructure necessary to support 60 sessions and 100 speakers."
Net Media organises both the annual Online Digital Media conference and European Online Journalism awards, which are traditionally presented on the last night of the conference.
The European Online Journalism awards will continue, however, with the call for entries due to be announced on 1 March. Full details will appear on the Net Media web site, said Mr Wallace, along with new award categories including best HIV/AIDS coverage.
The event attracts leading publishers and journalists from around the world. Last year's speakers included Dan Gillmor of the San Jose Mercury, Vin Crosbie of Digital Deliverance and Peter Vandermeersch of De Standaard.
Net Media was established in 1995, and will be working hard to secure a venue for its 10th anniversary in 2005.
"We are not short of offers to host the event. Several major institutions want us to bring the conference home to the UK for the 10th anniversary," said Mr Wallace.
"And ultimately, it's still our plan to take the event across the continent."
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