Stoney Brook Grille Happy Hour

We have a reservation for 15 people for Happy Hour. I received a confirmation for 15 at the counter but they want me to call a couple days ahead to be sure. They are familiar with meetup so they are trusting us to show. I'm assuming, maybe incorrectly, that most of us are familiar with Stoney Brook. At this moment they are not allowing us table seating for Happy Hour alone. When I call on the 6th maybe some of this information can change. We never know when we arrive somewhere whether it will be packed or not be too busy.
I'm asking, keep your rsvp current, PLEASE!