Low Country Boil....
Source: Jim Mixson as derived from several web recipes

10# new potatos, chunked
3# sausage (kielbasa/polish/smoked, etc.)
12 ears corn, halved
6# shrimp
4 large onions, chopped coarse
2 6 oz. packages Old Bay seasoning
1/2# butter
JGM mix (or salt and pepper) to taste

Place sufficient water in pot to cover corn and potatos when added
Add Old Bay and bring to boil
Add potatos, sausage, onion, butter
Boil about 10 minutes
Add corn
Boil another 5 minutes
Add shrimp
Boil about 3-4 minutes...no more
Add JGM mix (or salt and pepper) to taste

Serve by draining and dumping on a newpaper covered table.
 (This and comics is about all they're good for anymore!)

This recipe will feed 20 and is scalable.