i did this leanne when i first started and i did a posy and a modern piece, then i raffled them off for them. I started with "ive never done demonstrating so be gentle with me!!" This broke the ice and then i welcomed questions as i was going along. Ask the leader to ask questions if it goes quiet. Talk about the conditioning of flowers, where they come from, ask them if any of them likes to play with flowers, tell them which last the longest, what they would need to do their own arrangement. Just a few ideas.

And in my experience it should be called the over 100's!!