Legal Question in Civil Litigation in Illinois

If it is a subpoena and you ignore it, the court may issue a contempt of court order or issue a body attachment and send the Sheriff to arrest you and bring you to court for your testimony.

If it is a simple notice, you can contact the person who issued it and see if your testimony is necessary and see if you can testify via a deposition at a convenient time.

That you don't feel like getting involved is a non-starter. If you are a witness or have information that is important to the resolution of a case then you have a civic duty to come forth and inform the court of that information. You would want a witness in a case you were involved to the same for you. It is a responsibility that comes with agreeing to live in our society.

I hope this helps.