Pick sessions for your coderetreat from this book. You can read all the details from each session: constraint, when to use it, goals, facilitation tips, and history. You can read all the book, or just pick a few sessions for your event, it's your choice.
This book is thought to be a catalog of sessions that you can use also for other activities like: workshops, coding dojos, coding katas, mob programming, etc.
This book is a follow-up of Coderetreat - Hosting and Facilitation https://leanpub.com/coderetreat