Eric, all you need to do is email the ship coodinator to set up a meet and greet. They typically like to schedule the meet and greet for 10:00 a.m. the first sea day in Henry's Pub. If that is what she does, I would have a contingency plan for your group to simply filter out into the atrium if you don't have enough room. I would guess we had about half as many as your group and it was snug and cozy in Henry's, nearly to small of a space for all of us. Let her know how many people you are expecting. Our second meet & greet was an unexpected "gift" from Ray the cruise director.
I am sure you all will enjoy the Spirit as much as we did. Have a great time!