Sponsorships will remain in an event after an event is put in Active mode.  This allows Sphere users to set up their sponsors in advance if they so choose.  If the user would like to remove the test sponsor from their event, it can be deleted by: 
1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon 
2. Hover over thon name and click Bookkeeping
3. Click Manage Initiative Records 
4. Click the Sponsor radio button
5. Search for test sponsor
6. Click Edit
7. Give a reason and description for the reversal
8. Click Delete