Your expectation is that he will be reasonable and have his stuff sorted this weekend while you are away.
Your expectation is not based on reality. You are not dealing with a reasonable sane adult.
He is an alcoholic.
If he gets his stuff sorted at all, it will be at the last possible moment.
However, he may realize that you will get yourself worked up and do it all for him if he keeps procrastinating.
Today, you have the opportunity to enjoy the company of a good friend OR spend your day babysitting and worrying over a grown man. Which will you choose?