Harnessing the Power of Twitter : How to maximise return on tweets will take place at The Cumberland Hotel in London on Tuesday , 23 June 2009 . For more information and to secure your place , visit the conference website at www.iw-twitter.co.uk , or contact customer services on + 44 ( 0 ) 20 7921 8039 . If you 're a blogger and interested in earning yourself a free place , check out how on the event website .