In order to use these options you will have to connect the current event to the Event Email Template Campaign and connect the previous event with the current event in the event's Properties section:

To associate the Event Email Template Campaign with the current event:
 
  1.  Navigate to Communications>Event Email Templates
  2. Hover over the Campaign Template name and select properties
  3. Check the box for Select Events
  4. Click the search button
  5. Click Okay to accept the account
  6. Check the event that is the current event
  7. Click Add
  8. Click Finish
  9. Click Save
To associate the Event Email Template Campaign with a past event:
  1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon
  2. Hover over your event and click Properties
  3. Under Previous Event select the Previous event
  4. Click Save
  5. Go back to the Webinfo Checklist and click Publish This Event Now
The combination of these two steps will allow you to use the options in the receiver query for past events and current events.
  1. Click Properties
  2. Check the box for Select Events
  3. Click the search button
  4. Click Okay to accept the account
  5. Check the event that is the current event
  6. Click Add
  7. Click Finish
  8. Click Save
To link the past event to the current event:

  1. Go to Communities > Special Events > Friends Asking Friends > Kintera Thon
  2. Hover over your event and click Properties
  3. Under Previous Event select the Previous event
  4. Click Save
  5. Go back to the Webinfo Checklist and click Publish This Event Now