At some point, you have to stop adding extra sessions and re-arranging room allocations for the conference. Each year, we look at the sessions to try and spot obvious problems (like a speaker speaking in two different sessions at the same time – which we just did, and now corrected!), as well as looking at sessions that might be on at the same time – but of interest to the same audience. We always have to make some compromises on this – and apart from repeating sessions, this is a tough problem.
Now we are done – so expect updates on the web site, and more info here.