First, I wanted to thank all of the Effective Altruism Global organizers and participants. I found it to be very valuable and overall well put together. There was obviously a ton of work put into it, most by conference organizers who I don't believe will get that much credit for it, and I very much commend their work.
That said, there's always a lot of room for new ideas, and I find I often get a bunch of ideas at and after these conferences. Because of the EAGx events, ideas described now may be able to be put into action somewhat soon and experimented with.
As may be expected, I recommend that people make all of their ideas be independent comments, then upvote the ideas that they think would be the most useful.
Personal effectiveness discussions
In a more ideal world, most effective altruists wouldn't have to know much about cause selection. They would trust the group best at deciding, then spend their time being more effective.
As such, there's a difference between aspect of these conferences aimed at people interested in cause selection, and people interested in being effective, effective altruists. I would bet that discussions on 'effective study habits', 'effective networking', 'leveling up in software engineering', and similar would provide more decision value than ones on cause topics.
I don't have a take on these specific suggestions but I wanted to mention that I really like your effort to think about how the EA community can be relevant to people who aren't actively thinking about cause selection at a given time. I think this is going to be incredibly important if people at different stages in their careers are going to affiliate with the community.