Pile the blueberries and half the sugar on a large cutting board. Using a sharp knife, chop the blueberries into small pieces, working the sugar into the blueberries. Set aside.
In a large bowl, whisk the remaining sugar, eggs and oil until incorporated. Stir in the grated zucchini and the chopped blueberries. Add the flour, baking powder, baking soda and cinnamon and mix until incorporated. Pour into prepared pan and bake 1 hour.