I was referencing your comment about not being aware of any "solo dinners". There very much IS, and it starts with the solo meet in the lounge (or wherever on the ship it's being held), then the group goes to dinner.
and currently, on the ships with a Studio Lounge, the lounge IS available to solos in all categories if the nightly meet is held there (which, in my experience, has been every night on two trips on the Bliss and one on the Escape), but ONLY during the time of the nightly meet. The door closest to the lounge is propped open so those non-Studio solos can enter to mingle. At all other times, yes, the lounge is only for those who have key-card access.