That'd be a good idea. I've never (and won't again, not an Apple dev) attended one of these, are there official forums? Housing block for the hotels near the conference? If there's an official housing block it maybe easier, there should be a group managing it that you can contact directly. If you need a room, get put on a waitlist, if you have a room they'll offer it to those on the waitlist. Official forums or very popular industry forums would be great places to host this discussion because it'd have the greatest chance of reaching the audience that needs the rooms. (And HN would likely count as a popular enough forum, but with no subforum concept it'd last a day or two and then fall off the front page.)