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.
Pretty sure that more than pays for itself in the marketing power it has. Brochures for sponsors, advertisements for next year, etc.
I expect that marginal group photos have rapidly diminishing utility. If we kept using the photo from EAG 2015, the people for whom group photos have marketing power wouldn't know it's an old photo or it wouldn't matter.