First nine videos on Julia YT channels were uploaded in March of 2013 and they are from some gathering happening probably on MIT. Among attends you have the most important people in Julia community, so in thong-in-chick manner we could call it “JuliaCon 0th”.
They are not on any playlist, so I would suggests to create new one for them. They are to valuable to not be gathered in one place. At least Rationale Behind Julia and the Vision will always be important for Julia language and in my humble opinion other are also still valuable.
I can’t guarantee that I didn’t miss one, but for my money there are nine of them, links below. I try to put them in some reasonable order, but it just my attempt.
Rationale Behind Julia and the Vision, https://www.youtube.com/watch?v=02U9AJMEWx0
Metaprogramming and Macros in Julia, https://www.youtube.com/watch?v=EpNeNCGmyZE
Parallel and Distributed Computing with Julia, https://www.youtube.com/watch?v=JoRn4ryMclc
Numerical Optimization in Julia, https://www.youtube.com/watch?v=O1icUP6sajU
Fast Fourier Transforms in Julia, https://www.youtube.com/watch?v=1iBLaHGL1AM
Statistical Models in Julia, https://www.youtube.com/watch?v=v9Io-p_iymI
Data Analysis in Julia with Data Frames, https://www.youtube.com/watch?v=XRClA5YLiIc
Networking in Julia, https://www.youtube.com/watch?v=qYjHYTn7r2w
Julia Lightning Round, https://www.youtube.com/watch?v=37L1OMk_3FU
You can find propositions for timestamps to them here and here. I soon also make some for Parallel and Distributed Computing with Julia.