the main idea is to keep the
bees from overheating and suffocating. fly screen works pretty well.
close up the entrance in the evening after everybody's back inside. then you can
staple fly screen over the top in place of the lid so they've got plenty of ventilation, then move them.
alternately, if it's a cool night and they aren't completely filling the space they've got, you might get away with leaving the lid on and stapling the fly screen over the entrance. whatever you do, the quicker you are about it, the better.