The only one I did was VERY informal! I took a portabella sausage stuffed marinated boneless pork loin and literally harvested some parsley from the guys garden for garnish! I was the only one using a Weber which was on site. Everyone else did gasser projects. I did win hands down!
It was a very informal party and brought my own platter with board insert. Presentation was good for mine, even though the host had said that "Presentation will be a factor"
As I said, this was friendly competition and may not be quite what you're thinking about but, it was a ball! I was informed afterward that I had been the only one who took it as seriously as I did. Hey, it was really just making something I would have made for family with a touch more careful slicing. I need to bang out another one of those, I have not done one in a long time!
Have fun and I wish you the best of luck.