Suggestion for next year's organizers: extra night at the end
It has also been my experience in the past that the stragglers party on the very last night may be the best night of all! But that of course can only work out if there are several people staying.
The night before is typically not a problem, since usually that one is already included in the standard plans (but not in the guidelines either).
I've never thought that this would be important enough for the BiCon guidelines, but maybe it is? It certainly isn't as important as some of the other things in it, but I would certainly count it as a nice-to-have.