Hi, the lack of accommodation bodes well for a busy weekend!!
Our accommodation list is here - http://www.powerboat-training-uk.co....y%20(2008).pdf
If nothing there works out try Pooletourism.com or bournemouth.co.uk
You tend to find that B&Bs & hotels on busy weekends will only accept two nights or more until they get closer to the day then suddenly that elusive saturday stay becomes available. If you get really stuck give our Office a call and Viv or Esther will see what they can do.
I guarantee you will find somewhere as we've never had problem. Have fun!