The author of The DITA Style Guide, Dr Tony Self, will be presenting workshops in London and Stockholm in October.
There are two workshops in London: DITA authoring best practices, and Publishing with the DITA Open Toolkit. These workshops are presented by Cherryleaf on October 8 and 9; details at http://www.cherryleaf.com/training/dita-training-courses-in-london/.
The Stockholm workshop is DITA authoring best practices, scheduled for 15 October. This workshop is presented by FTI, the Swedish Technical Information society; details at http://www.teknikinformatoren.se/images/meetings/DITA2012/Invitation-to-DITA-Workshop-2012.pdf.