To change the information that is required on event registration web forms:
  1. Select the Web tab.
  2. Click Manage event registration forms.
  3. Find your event.
  4. Click the chevron to the left of your event. 
  5. Click the button labeled "Options"
  6. From the bottom of this window you can mark or un-mark the checkboxes for the information you want to appear or the information you want to be or not to be required. User-added image