Make SURE to allot time to cut/prep the meats. Easy enough to hold the food, but I'd put some thought into the presentation and what you cut when/first, etc. I would give everyone a "plate" of all four, give them a little sample judging form and have some fun with it.
Also, sides, etc.
You have plenty of food it sounds like for 30 people.
Shoot, even give yourself a little trophy. My trophy is a good bottle of Tequila