As one of those callers with 3-4 years' experience, I agree with others who've called for unusual formations like triplets and chestnuts. They're pretty hard to figure out on your own, and local dances will only want them if a caller already has them down cold.
I also would benefit from training in how to deconstruct, and thereby effectively teach, more difficult dances for an experienced crowd. Specifically - and for any dance for that matter - when learning a dance from a card, how to note points of potential difficulty and how to figure out the exact clear, concise thing to say then so the dancers don't get confused. David, your class sounds like a wonderful opportunity and I'm suddenly a bit sorry I don't live in the east. Break a leg! Tina