How does one host a great 4 hour workshop?

I’ll be presenting a workshop on “building decentralization applications using ethereum” in early Jan next year. As you see, it’s a very technical topic involving blockchain and related concepts. I’ve been given a 4 hour slot and I’d like to make the most of it.

Content is solid. It’s all listed here. I’m yet to freeze the structure of the workshop, so any help is appreciated!

Are there any tips you’d like to give me? What are the challenges you usually face in long workshops, and any ideas on how to overcome them?

Also, if there are any interesting ways to make the workshop interactive and lively, I’d love to hear them as well.

Thanks in advance!