Sooooo.
Anyone who's read any of my comments about this kind of situation knows the first thing I always say:
Don't participate.
Period.
Is your sobriety more important than anything else?
If so, I'll tell you that at just 3 red flags leaped out at me from both your OP and follow up:
The desperately wanting "a glass"
The "solution" is to go out to dinner where alcohol is an option. With your husband who drinks (heavily, from your description).
You being the one to get supplies for this party....
I simply cannot stress enough that "feeling positive" is just not a recipe for success - a plan of action is. That includes - very very very strongly in my view- turning down any invitation in early sobriety that challenges you- and this does in so many ways.
However. IF you CHOOSE - note the caps because that's always your choice - this isn't a must, there are NO musts, and others cannot be your whys not to drink....
Then have a plan.
Play the event thru- with you sober.
Keep water or a glass of something cold and to your taste (that doesn't resemble wine!!!) in your hand at all times.
Take a breather (ie go inside, get more chips, WHATEVER) if you get the tiniest inkling of anything squirelly. And I mean the tiniest and of anything very literally.
Find someone who is not drinking to talk to - there must be someone, you just haven't noticed them as much when you were drinking heavily?
Duck out totally if you need to.
Play the WHOLE tape thru til tomorrow. How do you want to wake up?
It's all up to you and I am consistently redundant about things that keep us sober: always, always pick the choice that takes you further from a drink rather than closer to one is simply the best plan. Especially early.
This is ultimately a life and death disease. In the situation of being around people drinking 3 bottles a piece, your mind has already been going to "just one glass" (and possibly the thought - " no one would know, in comparison, cuz they'll be drunk!" - ??) and as others have said....we can't do that.
I say ALL this out of concern, from experience, and from watching people get sober - or not.
Let us know what you decide and how it goes. No matter what. We want you here, and support you being sober.