(Not sure where to provide feedback on the conference, writing here because it mentions SwapCard, and the stuff I say here probably affects virtual attendees too, even though I'm an in-person attendee)

EDIT: Other people reporting many of these, including possibly a huge vulnerability where you can read anyone's "private" messages if they are part of an organization

I really dislike SwapCard. It has some ridiculously stupid and annoying things, some of which really should have been fixed after the literal first time anyone ever used it for a conference:

• As far as I can tell, I am literally unable to tell SwapCard that I'm not attending a meeting that conflicts with a time I am leading a discussion. I've tried canceling the meeting on two different pages on the web app, as well as the phone app. The web app provided zero feedback, the meeting just stayed uncanceled. The phone app told me that I can't cancel the meeting because I'm not the organizer. I looked for a place to say "I can't attend this meeting", and didn't find one.
• It seems to be impossible to meet people for any amount of time other than "30 minutes". I can't even schedule a second meeting to get it up to an hour, I think. (Although maybe what's happening is that it's noticing that there's no time that works, now that my schedule is nearly full?)
• ^ Thanks to the above two points, I can't book a new meeting to replace the one to be canceled, because I already have a meeting (that I can't cancel) and I'm not allowed to have another meeting. Instead I have to make a slot free so the other person can schedule the meeting. (And of course they might not be free, I have no way of checking. Or possibly someone else will snipe that slot on my calendar before they can do so.)
• Want to change the location of your meeting? You have to cancel and re-book, I think. Which, as we've established, is not something you ever want to do.
• It doesn't always merge message threads with the same person. Multiple times, I've gotten a followup message from someone, that SwapCard presents as though it were the first message I got from them. If I want context (which I usually do need), I have to go find their original message to me.
• If you accidentally click away from a drafted-but-not-sent message, you lose the message.
• It seems to have zero warnings about conflicts in your schedule. Conflicts are hard to notice, because instead of having a calendar view, it has this strange "list of events" format.
• Until recently, there was simply nowhere on the site (to my knowledge) where you could see all the scheduled events happening at a particular time. Now, the Agenda tab does this (though still with an annoying "list of events" format), but I'm pretty confident it didn't previously.
• As far as I can tell, the "connection" feature serves no purpose other than to waste time and make people uncertain about what it means to be "connected".
• Sometimes I click on a profile card and nothing happens (i.e. it doesn't seem to link to an actual profile).
• If you're hosting an event, SwapCard won't put it on your agenda, and people might book meetings with you at those times unless you specifically mark yourself as unavailable.

I would have been happier with a Google Sheet with separate sheets for attendee profiles (with some way to contact them), speakers, organization profiles, and another sheet contains the agenda in a sane calendar-like view. People can schedule meetings using their existing calendar. (I'd assume this is also less work + less money for CEA.)

(EDIT: I work at DeepMind, which is part of Alphabet, which makes Google Sheets, which one might technically consider a conflict of interest, though honestly that connection hadn't even crossed my mind when I first wrote the comment)

There are definite downsides, e.g. attendees might not want to share their email widely, Google Sheets is less pretty / "professional" (gotta love that "professional" = "looks better independent of functionality"), the search functionality is a bit worse. It's also quite plausible that there are features other people find valuable that I don't care about and haven't discovered. But at least for me SwapCard is not worth it.

What level of screening are you doing for virtual attendees? I'm trying to remember what I included on my virtual profile - suddenly hearing that access to my virtual profile which I thought was going to be exclusively shared with about 200 highly engaged EAs is now something you're advertising as a selling point to a larger audience was a bit of a shock.