If you offer region-specific training, using the multiple category features of GoSignMeUp is an easy way to organize courses.  Creating an Optional Sub-category for each city will make it easy for registrants to find and sign-up for the classes in their area.

To create the Optional Sub Categories, navigate on the Administrators menu to Configuration|System Configuration|Course Management| Categories/Sub-categories.  Here you can define the Main Categories, the Sub-Category 1 and Sub-Category 2 listings.  

After you input the Main Categories, Sub-Category 1 and Sub-Category 2 information, make sure to click the Update button at the bottom of the page.  

The Main Categories, Sub-Category 1 and Sub-Category 2 information appears in the associated drop menus on the Course Dashboard page for a specific course.  Here you can assign the Main Categories, Sub-Category 1 and Sub-Category 2 values for the course.

On the public side, when a student clicks on the Category buttons on the left, they expand to show the Sub-Category 1 and Sub-Category 2 values.  
Finally, when a student clicks on the Sub-Category button matching their region, they are presented with the courses in their area.