Some places offer "First Attendance," some don't. When you file the paperwork, they'll sometimes send you a notice of First Attendance. This would usually be a month or more in advance of an actual trial, if one is going to occur.
First Attendance is just a meeting between you and the Prosecutor to reach a resolution and not go to trial. The advantage of this is, if you want to plea-bargain, this gets it out of the way. Conversely, you can't "change you mind" down the road and you would lose a chance to win completely - if that is your goal. It all depends on what you want to do. They may ask, at the outset, "what are you looking for?" If all you're looking for is 15-over, tell them and you should be good to go... or you could try to low-ball them and negotiate to what you really want. They might say "we're prepared to offer you this..." Different approach, same result. Like police officers, though, they deal with a lot of really ornery and ticked-off people, so if you walk in there polite and reserved, it will go a LONG way.
If you're determined to win your case completely (not saying that you are), then the only thing to do at First Attendance is go "I'm not guilty, drop the charge," end of meeting.
If First Attendance is not offered, no big deal - just show up early on your trial date and speak with the Prosecutor. The earlier, the better.
Hope that helps...
* The above is NOT legal advice. By acting on anything I have said, you assume responsibility for any outcome and consequences. *
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