How to delete celebrants 

Currently, the software does not allow you to delete celebrants from the Lookups Table. Celebrants can only be merged. Here is a video that details how you can merge celebrants: How to Manage Lookups (Video)

You may wish to move the celebrant to the end of the list if they are no longer going to be used by your organization. 

How to move a celebrant to the Bottom of Lookups

Go to Administration → Lookups → Celebrants

1. Find the celebrant and mark the checkbox.
2. Click the "Move to Bottom" ​ button.
3. Click Save List Order.