I do a lot of school presentations.

First I play a tune.

Describe basic operations of bagpipes. Show a chanter reed out of a chanter, a drone reed out of a drone. Demonstrate individual drones.

Describe overall learning process. Show and demonstrate a PC.

Explain dynamics and rests. Demonstrate embellishments.

Play another tune and suggest they try to hear the different parts as you have demonstrated.

Talk about the kilt, play another tune, take a few questions, and your 30 minutes are over.