Bridal Dress Salons for a Double Bride Consultation

Hey ladies (& few gents)! I've been thinking of dress shopping and how my goal is to have both my fiance and I go dress shopping at the same time with both of our bridal parties and moms. I don't want us to see eachothers dresses or even have any idea of what the other wants, however, I want to make sure we can blindly stand side by side and make sure we look good together. I've seen it on Say Yes to the Dress, and I know that perhaps I should not expect that kind of experience from a local boutique. Any ladies from Northast Pennsylvania have any suggestions? Or anyone in general have any thoughts you'd like to share. I plan on researching a few salons and finding a few that I think would fit our needs and budget and then sending out emails seeing if it's possible. For those who have purchased their dresses already, how soon in advance did you book your consultations? I'm sure it depends on the area you're looking in, but I'm just curious.