We use the Youtube Studio Content Manager. That should be the correct system. @rayegun would have the exact details here but they seem a bit MIA right now and I haven’t used this part so 
but my understanding is that those instructions match what was used for previous JuliaCons (basically just a spreadsheet upload)
I don’t see any “Content updates” button in the left menu that is mentioned in the YouTube docs linked above. Thus I’m a bit unsure whether this bulk upload actually works, and where to perform it
In 2022, the Juliacon folks used a commercial software package called Airtable (and a Julia package called Airtable.jl) to automate the workflow. I think I used it too, for thumbnails…
Although, I don’t recognise it now from their web page (they appear to have added the letters ‘A’ and ‘I’ to everything 
).
I assume that licences and expertise are long gone now.
It’s okay, I just spent one hour inputting metadata by hand, which is probably shorter than what I would have wasted automating it. For a Local it still works.
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Just as an idea for some other time, I’ve had some success doing mini-automation with webpages that don’t offer any themselves by letting Claude or so write a little javascript snippet that does whatever you need, you can paste one html page in and tell it what you want and it will probably do an ok job of figuring out the right css classes to target etc. So then you could paste in your data as a json literal in the browser console and have the script check for the right title or something and then fill 10 fields with metadata.