Hull Jazz Festival
This takes place every year over two weeks of events. This year it was on 29th July-5th August (2007) and has been going for 15 years.
Unfortunately I didn't get to it this year but have been in the past. It used to be right by the marina in a boat yard and just over two days, now it has a grand opening in Queen's Gardens with events all around the city during two weeks. Though because of it co-inciding with the Wilberforce 2007 events it was a little larger this year.
Here's the council's website Hull Jazz Festival
It is a mixture of free and ticketed events.
For more information phone (01482) 300 300.

Arctic Corsair (docked at the old port)
Wilberforce House & Museum
Humber Bridge from the pier
Bishop Burton