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Thinking of going to Digital Marketing Cambridge - this is last year's site, but I bumped into one of the organisers the other evening and she assured me that they will be holding another one this year... http://www.marketingconference.co.uk/
Maybe Internet World, and perhaps something like Adtech later in the year... Oh, and DomainFest in Barcelona in June, if and when it gets announced and as long as the dates don't clash with anything else.