DESI stands for Discovery of Electronically Stored Information. I have already written about DESI VII at Kings College London on 13 June.
There is a draft programme here from which you will see that it is chaired by Jason Baron of Drinker Biddle & Reath, and that the opening keynote is to be given by Maura Grossman and Gordon Cormack with the intriguing title Selective Digital Amnesia.
That this is a serious and heavyweight event is clear from that and from the other talks and papers on the agenda. DESI VII is part of a wider London event called ICAIL 2017 – the 16th International Conference on Artificial Intelligence, and registration for all or part of the conference can be done through this page which also links to a list of workshops. You can register for one day only if you like.