1. Navigate to Control > Query
  2. Click New > All Contacts Query
  3. Expand Contacts > Profile > Profile Highlights > Email
  4. Click Add
  5. Select Not Empty from the dropdown menu 
  6. Expand Communities > Special Events > Friends Asking Friends > Kintera Thon
  7. Click the Choose Event link
  8. Mark the checkbox(es) next to the event(s) you want to exclude
  9. Click OK
  10. Scroll down to Participants and click Add
  11. Click the NOT qualifier
  12. Click Run Query