You're getting the cart before the horse now

But, I'll give it a shot.
Yes, there are ugly, fat, old, toothless people that attend these functions. But, there are some great looking people that attend also.
We've met people from all walks of life. Doctors, Lawyers, even Cops

But, if you go into the place with a fixed idea of what you're looking for. Most likely, you won't find it.
There is so much more to people than their looks and lifestyle you need to be concerned with.
Rating people on a 1-10 scale. We've been with 10's, and we've been with 4's. But, their personality has always been 8 or better. Personality goes a very long way with us.
I absolutely would not have a LARGE woman. Although I have been with a few, and enjoyed every minute of it too.

And, Maggie hates the idea of a "real skinny" man. But, sometimes things don't always appear to be what they are.
Bottom line. Just go. Enjoy yourself. Meet people. Try to have fun, without placing any pressure on yourself or spouse.