CustomPress URLs

Hi,

I have the following on main pages of an events website
event.com/speakers/
event.com/speakers/anne-example/

which works as expected.

The website is also broken up into sections
/event.com/south/
/event.com/north/

I can create a page here by adding a category 'south'
/event.com/south/page/speakers/
which lists speakers who are speaking at the South event. However links go to /event.com/speakers/anne-example/

I cannot get the following to work as expected
/event.com/south/page/speakers/anne-example/

Can anyone help me with this?

Many thanks,