(I am a lawyer but I don't practice any more) For informational purposes, a subpoena is for the witnesses to an event. They don't need a lawyer. A subpoena is the device used by court to officially notify a witness that they need to be at a certain place at a certain time for an official interview to get a recorded official version of what they saw. It is not for the trial - that would be a trial subpoena. It is an opportunity for both sides lawyers to ask you under oath what you observed. There will be a stenographer there as well (this is the person who types everything into that crazy little machine and then transcribes it for both lawyers).
I imagine that one side is suing the other over what happened ( a civil case) and they need the official statement for the record. Or that the guy has been charged with a criminal offense and it could later go to trial (a criminal case), but that seems unlikely given the time span since the incident.
Don't ignore it, it is a court order and if they want to be obnoxious (usually if a witness is repeatedly not showing up) they can apply for a appearance warrant which is actually an arrest warrant for the sheriff to go out and pick up a person who is refusing to appear for a subpoena. If your boss tells you to ignore it he can be criminally charged with obstruction of justice. And if he does something dumb like fires you for appearing under subpoena you will have a nice lawsuit against him.
You may be reimbursed for expenses such as parking and a meal so call the number back on the subpoena and get details on that.
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