Cocktail, please. But we want you to feel comfortable, so if those shoes are too high or that top button is too tight, let it all hang loose.
Yes kids are welcome however we want this to be your night off to let loose and enjoy yourself so if you can get a sitter please do so but if not the more the merrier.
If your invitation says "and Guest," then yes. Please include the correct headcount in your RSVP.