Because sales orders have been created for the event, you are unable to delete the scheduled program or scheduled program event. Instead we recommend that you mark the program inactive, or delete the sales methods for the event if you would like to use the program for other events in the future. 

To mark the program inactive:
  1. Go to Events > Program Search
  2. Search for and open the program record
  3. In the Tasks section on the left side of the page, click Mark program inactive
To delete the sales methods from the events so that tickets can no longer be purchased for that specific event:
  1. Go to Events > Program Search
  2. Search for and open the program record
  3. Select the Event List tab
  4. Click the drop-down arrows next to the event and click Edit
  5. In the "On-sale information" section, click the gray box to highlight the line for a sales method
  6. Press delete on your keyboard
  7. Click Yes in the window that pops up
  8. Repeat steps 5 - 6 for each sales method
  9. Click Save