Hey, I really understand that part of the business chain and I feel for you. When my website was just beginning,
Ok, I'll skip the story. But the thing you have to remember is all the people that are proud of you. If your staff isn't already enjoying their work, improve that. You have to first gain trust from the lower part of the chain. After that, you slowly build relations with the upper part of the chain by calling people up for advice how to improve maybe one month after this meeting. Get that person's opinions, build off of that and work harder. Next month, get another person's input and adjust the place accordingly. Do this for some time, and before you realize it, you'll become friends with those. After that, its hard work and a little bit of luck. If you ever have any questions or anything, feel free to ask me.
One more thing, work REALLY hard these next few months after the meeting. You need to show them you're serious, because honestly, there will be a ton of people who can bring the POC up a little after the person before, but very few can survive a bad meeting, improve from that experience, and get to that high POC level.
Also, if you didn't during the meeting, call up each person, and ask HOW to improve in each area. Or call another meeting if you didn't really get any input on HOW to improve. I'm talking down to earth details, not vague ass results like "Keep the customers happy." I mean answers in the form of: "Guy 1 in the food line is a little slow, put him in another spot or help him out personally get a little faster, this way customers get food faster, making them happy."
Take that meeting as a learning experience more than a "We want to bash at you" meeting.