
Quoting
BOR
Unless you have an arguable affirmative defense as outlined, or another the court/jury may buy, you are most probably out of luck, as I said, selling beer to an underage person is a strict liability crime.
To abrogate the stictness of it, you need to provide a believable defense.
IF you can retain your own lawyer to try to attempt to bargain for a lesser charge. I have not sat in on a court proceeding in a while as an observer, but they may, before direct arraignment, ask each individual how they intend to plead before the Judge. IF this is so, ask if a plea bargain can be worked out and see what happens.
Back in my criminal law days I would sit in once a month or so, but it has been awhile.