A huge amount of responsibility rests on the shoulders of any citizen who receives that once in a lifetime letter in the post. He or she has been summoned. He or she has been summoned to appear in court. No, this is not something to be afraid of, although there are those folks who hesitate to accept this responsibility. But usually, such reluctance is few and far between. Your local and state authorities do not treat this matter lightly.
Yes, it is true to a degree that a random draw is made, but you can rest assured that the powers that be have already taken into account your outstanding qualities as a good and patriotic citizen. You are never in trouble with the law and, no, because you pay your taxes and all other bills on time, you do not receive those other dreaded summons. But there are those moments when random, unexpected events occur.
And it is quite possible that you are caught in the middle or on the fringes somehow. No, you are not necessarily in the wrong place at the wrong time. Rather, you should regard this as a good opportunity to step forward like a good citizen and give an honest account as best you can. Yes, you are still human and cannot be expected to remember every last detail which would be critical in a court of law in any event.
In which case, the legal minds and professional investigators manning expert witness services will not be summoning you. It is usual for them to rely on court injunctions in the event that a witness to events is reluctant to testify. But if you are a role model to your community, you will be stepping up willingly.