Build an automatic door and install hot wires around your set up. I'm not back from work during the winter until three hours after dusk and I don't worry about a thing.Have to be back in time to lock the chickens up. Can't go anywhere overnight.
Also build your run so it is as predator proof as your coop and you don't have to close the pop door to the run. Everyone will be secure and you can do your final head count whenever you get home from your function.