Sweetie, of course he is going to drink, he's an active alcoholic. You're not responsible if he does or doesn't. I can't imagine the stress you are putting on yourself trying to control a situation that isn't controllable.
What if he has to go to the bathroom while your're busy "entertaining" him? What if he slips out to the garage? What if... Do you see how futile this is?
So lets say he does drink. What can you do to not be a part of it? One of the last times my AH was living at home and was clearly drunk, I spent the remainder of that time in my room reading and watching tv. I let him go be drunk by himself in the living room.
You don't have to be around it; you don't have to pick up the mess he creates while he is drunk; you really don't have to babysit and put those sorts of pressures on yourself and keep repeating the cycle.
I'm glad you have alanon and counseling coming up. It will help you start sorting thru all these feelings. It's a long and painful road to our own recovery.
Big hugs.