Sigh? Damn, you're hard to please.Sigh.....
So let me spell it out for you:
If I had a choice of doing an event for my regular rate, or a lower rate, and the only difference is the number of people, I'd do the one at my regular rate.
If I had a choice of doing an event for my regular rate, or a higher rate, and the only difference is the number of people, I'd wonder why the other client was offering more, and end up doing the one at my regular rate.
As I said previously, the number of people is irrelevant.