The results of Participant Queries include the entire constituent record. Reports and Mailing within Raiser's Edge consider the Query results, not the criteria that created those results. In order for the Name Tags to only display participants for a specific event an Event Query should be used or please attempt the below suggested workaround.
Adjust the parameters as follows:
- On the General tab of the Name Tags, click Include> One record
- Search for the event as needed
- Double-click to select
- Click Preview
- Results will show only name tags marked Not Printed for the specified event