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code: https://github.com/GoogleCloudPlatform/cloudbowl-microservice-game
I've used this as the main platform in the past https://github.com/facebookarchive/fbctf . It takes care of the registration, points, dashboard part of a game day.
If you wan to avoid doing that, I'm not aware of any open source challenges but the workshops are a good start https://github.com/aws-samples/aws-security-workshops
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.