This repo contains a short slide deck, located in the docs folder. You can use this slide deck to introduce Packer to the audience, and then proceed with the hands-on part of the workshop. The hands on exercises are taken from the Microsoft Azure tutorial pages:
https://docs.microsoft.com/en-us/azure/virtual-machines/linux/build-image-with-packer
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/build-image-with-packer
There is also a 'live' version of the slide deck published here: