Thanks for this. I'm not sure if it was unclear but I wanted to clarify that this entire day is dedicated for the entire dev team as a group and not individually which is why I wanted to do something more interactive as a group rather then have a multiple people present a topic.
The reason I say this is that my post reads like everyone gets the day off to individually learn and some of your suggestions reflect that.
1) I've never heard of these terms however the PSP sounds like something worth looking into, it helps people improve themselves on an individual level.
2) This sounds like more of an individual thing and I'll look into this in my own time
3) This looks like a good group task to introduce but it would mean having to think of relevant problems which may lean more to the "work" side of things, not sure how I could make this more engaging
4) This feels like something that needs to come from the business but unsure if this applies here, I'll need to read the link you posted to get a better understanding of how/if it fits into the purpose of this day
I'll look into 1 and 3 but at the end of the day I don't know if I'd be confident enough to read up on this and understand it to the point I'm able to lead the entire team on how to approach it. But you've introduced me to a lot of new things I've never heard of before and I'm keen to delve further so thanks