The general usage involves "published" and "private". As summons are generally either emailed or "snail-mailed", they are considered as being published. Anyone can generally obtain possession of an email or a mailed piece- there is no guarantee that it will only be seen by the intended recipient. As to "trial", are you referring to a Masonic trial or a civil/criminal one? If the former, the witness/defendant & others involved would usually be notified personally. If the latter, it is doubtful that the Masonic connection would be mentioned. Additionally, non-Masons, such as most court personnel, are not bound by Masonic law.