I found a bed and breakfast about a month ago, Yorkshire Tourist board will email a list of vacancies and you can check them
http://www.discoveryorkshirecoast.com/content/where_to_stay/whitby/wh_accomodation_search.asp#result

It's not so hard to find as when the regatta used to be the same week.

I started a Whitby thread a few weeks ago, more info there. Stick Whitby & 90 days in the search boxes, cos I can't do these blue clickies.

Enjoy it, it was a great festival last time I was there