If you fail to show you CAN be arrested. I have been ordered to do so by judges in the past so I know it can and does happen. I even had to travel out of town to hook a DV victim up and then transport and book her into jail until she could see the judge a couple days later.
The 5th Amendment only applies if you were to be making statements that might incriminate yourself. You are being subpoenaed as a witness, you are not on trial, therefore unless you are willing to explain to a judge WHY your statements might incriminate you in a crime, you will almost certainly be ordered to answer any questions.
- Carl