There is a CILIP East of England Information Services Group/ UKeiG event on 11 May 2016 at Cambridge University Library, UK: Deep Web Searching and Content Mining. "Typical search engines like Yahoo! and Google only pick up about 1% of the information available on the Internet. The rest of that information is considered to be hidden in the deep, or invisible, web. So how can you find all the rest of this information? Come along to the ISG East of England meeting held around their AGM and in association with UKeiG, which will try to answer this and other questions."
More info at http://www.cilip.org.uk/uk-einformation-group/events/deep-web-searching-content-mining Photo By Sheila webber: white cherry blossom, April 2016