it's unfortunate that for various reasons Polaris Game Design Retreat can only be attended by ~30 people every year, but it's EXTREMELY fortunate that those people tend to write up their findings and learnings, and give it away FOR FREE, check it out: https://polarisgamedesign.com/reports/
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I dunno how Polaris works, but I sure am glad it exists!!
- get designers together
- have em pick design problems that interest them
- have em discuss in small groups comfortably for ~2 days
- get em to write stuff down