The Witches of Gulfport - S5-E21
Continuity mistake: While Mac is in a restaurant with three of the Wiccans, another woman comes over to give them verbal abuse. When you first see her, part of her dress is showing. When the camera comes back to her, that part is no longer seen. Also, the exterior scenes indicate that the location really isn't Gulfport.
Answer: Officially, the individual has been ordered to attend, failing to could be interpreted as either, Failure to follow orders, dereliction of duty, going AWOL, or even desertion. It would depend on the underlying reason as to why the person doesn't appear.