Great questions Stefan! I asked the organizers and the are open to us doing a Keynote, there are two rooms hosting keynotes at WCC so there are options. Also, Stan Larimer is already speaking so just need to discuss some logistics. I'll tag you in the telegram as we work out those details and post the outcome of that discussion here on the forum as well.
As for attendance, it's a bit hard to say, however, we can make an effort to poll the audience for interest and make some guesstimates. I will say that Bitcoin/Blockchain conferences are an ecosystem in and of themselves and it seems like people live for those things haha. So, usually people are able to take the time off due to working in the industry itself, however, I've met non-crypto industry people who will usually attend a day or two depending on their schedule. The fact that it's partially on a weekend might actually work in our favor from that standpoint.