Hi--I have no idea what area you're in, but if you're near a national battlefield park, e.g. Gettysburg, Shiloh, Antietam, etc. sometimes the artillery reenactor units that provide demos there will have a school of artillery in conjunction with the NPS. They recently had one scheduled at the Monocacy National Battlefield for example. If you're not close to any NPS battlefield parks, then I'd suggest contacting an established artillery unit and getting their advice--there are lots of them. I know of one in my town, but I don't participate in field artillery, although I'm usually on the crew that mans the Parrott Rifle on the USS Constellation when we do events there. I could get you some contacts if you need them--send me a PM. It's great that they're starting that group and that you're getting involved!