visa date schedule in 2 weeks possible?

I am getting married on 17th Dec 2018 and my return trip is planned for 5th Jan. I would like to schedule my wife’s H4 interview and stamping so that she could come back with me. However my lawyer says she cant fill out the ds160 as married unless we actually are married which leaves us with the option of filling out the ds160 and scheduling the visa date post 17th dec. Does anyone have any information on if visa dates will be available in such short time frame?