One more addressing question.
Did you address your STD's in the same formality of the invites? As in Mr. and Mrs. John Doe or just "John and Jane Doe"?
Also, with those who are getting a +1, did you write "and guest" on the STD? I've heard people say to just send the STD addressed to the person invited, but I feel like the point of an STD is to prepare and make arrangements. If they get a +1, their date will also need some notice. Correct?