I don't know much about Luaus, except that they used to have pigs roasted on a spit.  Well, how about a modern day snack shortcut?  Try Pigs in a Blanket - it's a great finger food and to help keep it in the theme of things, you could come up with some hawaiian inspired dipping sauces. 

I like to use the little pre-cooked sausages that are in the lunchmeat section.  I think they're called Little Smokies by Hillshire Farm and they may come in various blends/flavors.  

The other item you will need are those refrigerated packages of crescent rolls sold in tubes.

Open up your tube of crescent rolls and sub-divide each triangle, using a knife, into 3 long, thin triangles.  Take one of the little sausages and start at the end opposite of the point - put the sausage along that same edge and roll it up in the crescent roll, rolling towards the point.  You'll notice that the edges of the sausage stick out - that's OK!  Now, just bake them in the oven, with times similar to the time/temp required for the crescent rolls - keep en eye on the first batch to get the time that works best in your oven.  I go for a medium brown on mine to make sure the thickest part of the dough is cooked.  You can make the roll ups in advance and just pop them in the oven when you're ready.  These go fast!

Breakfast Pies 

Serves 10

3/4 pound breakfast sausage

1/8 cup frozen chopped onion

1/8 cup minced green bell pepper

1 (12 ounce) can refrigerated biscuit dough

3 eggs, beaten

3 tablespoons milk

1/2 cup shredded Colby-Monterey Jack cheese

1) Preheat oven to 400 degrees F (200 degrees C).

2) In a large, deep skillet over medium-high heat, combine sausage, onion and green pepper. Cook until sausage is evenly brown. Drain, crumble, and set aside. 

3) Separate the dough into 10 individual biscuits. Flatten  each biscuit out, then line the bottom and sides of 10 muffin cups. Evenly distribute sausage mixture between the cups. Mix together the eggs and milk, and divide between the cups.  I use my turkey baster to suck the egg mixture out of the bowl, and then I squirt it over the sausage. This works great, and not nearly as messy as trying to pour the mixture into each muffin cup.

4) Sprinkle tops with shredded cheese.

5) Bake in preheated oven for 18 to 20 minutes, or until filling is set.

The number one food for 20 something guys: Sandwhiches.  I recommend that you go to your local warehouse type grocery store and get 3 of their large bags of small french bread loaves. They look like the rolls that are used for foot long sandwhiches, except they are small. I make miniature meatball sandwhiches with cheese of course and all the guys at our church picnics LOVE them! For a luau I would make BBQ, pork or beef brisket. These are very easy to make. wrap them in aluminum foil (individually) and put them on the fire pit to reheat. I cook my pork roasts (always the least expensive meat) in the crock pot in water and spices like garlic and onion, and a little ceyenne pepper if you like a little spice. Drain the water off the meat when it is done ( you should be able to shed it) and mix in either your own bbq sauce or your favorite bottled sauce. slice the small rolls with just a small slit in the center and stuff with meat and cheese. roll in foil. If you are doinf the beef i recommend beef brisket ( cost is deffinately higher than pork). Play around with the spices you like. Remember to have fun, you don't want to be too exhausted to enjoy your party.  Another thing I like to do is cut large potatos into wedges and roll them in olive oil and fresh garlic onion powder chilli powder and salt and rost them in the oven. These too travel well and you can re-heat them in foil over the fire pit. You can spice them up or down. you can even use this same recipe for tater skins, just scoop out the tater and season them up. I hope you have a ball at your party. Be safe.

Meatball Sauce
1 cup applesauce
2/3 cup brown sugar
1 small onion, finely chopped 

had a luau year before last..fabulous.  had bunch of fruit in a pineapple, and some in a regular bowl (mine was soaked in pineapple rum....delicious), grilled out (chicken, burgers, hotdogs, brats), chips.  we had people bring food also, beans, potato salad.  hard to remember all of it, but that is the most of it. 

Wow! This is quite a list! Thanks for sharing all of these helpful recipes.