Hi Xar,
This question was recently asked by another attendee so can mirror that conversation here. Essentially, the convention have exclusivity on the hotel from 6pm onwards. Before that time, the public space is open to anyone, including other hotel guests, and outside delegates. Once hand over completes, CF essentially take ownership of the entire hotel and put our own policies into place.
Given that there are no actual scheduled events on the Wednesday, we are not opposed to non residents using the public spaces, bars etc.. to socialise on the Wednesday beyond 6pm however, we must be very firm in reminding people that any attempt to stay the night in another guests room will be seen as ghosting, and in violation of the code of conduct.
In short, please feel free to hang around and socialise in the public space, but do ensure that you have arrangements in place, which is clearly sounds like you do, to leave the premises in the evening.
Hope this answers your question enough to allow you to book your flights
