This weekend, Drupal's Frontend United conference is being held in London. The idea is to bring together everyone involved with the visual display of the site - concept designers, UX professionals, web designers, CSS/HTML experts and other theme implementers - to discuss how best to implement frontend development in Drupal.
A prior arrangement means I can't go, but you should do so if you're involved in any aspect of Drupal themeing. Tickets are still available, so get one now!