Originally Posted by
Redgremlin 
It is important to my husband that I go.
More important than your sobriety? In what way more important?
I usually tell people who are newly sober not to put themselves in situations where drinking is the primary focus, such as wedding receptions. So one strategy might be to explain how your sobriety trumps whatever reason he says is important to him. He can go alone.
Failing that, ask if you can just make an appearance, then leave before the temptation to drink becomes strong.