Peter B's comment reminds me of what my mentors told me when sending me out for field visits the first year in my career. Don't be worried because you still know more than they do. LOL.
My boss called one weekend only a few weeks after I had started, and left a message that I needed to be in Michigan to perform a "static pressure test" on an newly installed irrigation system. I had no idea, but figured I could bluff my way through it. Fortunately, he had an individual he trusted there to sort of guide me through the ropes. That actually happened a few times.
I have told this story before, but they sent me to a private club to discuss some plans. I had drawn them and could explain them well, but they were expecting the big gun, who had also cut a deal to credit any of their fine lunches as the first hour to reduce the bill. I explain the plan, we go to lunch, and while the committee orders steak, lobster, etc. they lean over and tell me, "The grilled cheese is good." LOL, luckily I like grilled cheese.
For some snarky answers, "have a briefcase and come from out of town" is often heard, as is "being a member on the greens committee" since many of them clearly think they know more than their consulting architect. That is one reason I have rarely worked at equity clubs, I just don't like dealing with 10 or 300 bosses.
I have found that coming with a sterling recommendation from at least one club member helps them respect you as an architect. I also have seen where being direct and firm, but not rude works wonders. At a recent site visit, a committee person suggested it would be best to split the project up into a bunch of small ones, for example. I politely but firmly stated that it hadn't been my experience for a few good reasons, 1)Better Billy Bunker (and other liners) are installed by "certified installers" who are busy enough that they have turned down less than 9 hole projects, and even less than 18 holes, 2) Members will be annoyed at constant disruption, 3) It will cost 50% more, maybe even higher. They respected that far more than the old "We can do it any way you want to" approach. Obviously, some flexibility is good, but being firm in your convictions goes a long way.
In the end, it goes back to an old consultants saying, never forget they are looking for recommendations and solutions, not "feels" (as in I strongly "feel" this is the best solution)