I have gotten these from a couple of places. An upscale grocery
store in our area printed a pamphlet & there is a website for
quantity recipes, if you use a search engine (like google) &
put in growlies you will find it. You can search under Byerlys
also (they are the grocery & something may be on their site,
they always have fabulous recipes, too). Anyway, here's the info
I found.

Condiments (This ifo came from Byerlys & is for 50, so double
it for your needs.)

Ketchup (approx. 66 - 1 T. serving) use 1 (40 oz) bottle
Mayonnaise (approx 64 - 1 T. serving) use 1 qt.
Mustard (approx 51 - 1 tsp serving) use 1 (9 oz) jar
Butter - 1 to 1 1/2 lbs
Mixed nuts - 1 to 1 1/2 lbs
Olives or pickles - 2 qts (it doesn't specify whether these are
hamburger pickles, baby dills, or reg pickles sliced into wedges)
Baked Beans - (1/2 C serving) 1 1/2 to 2 gallons
Potato Salad* - (1/2 C serving) 1 1/2 to 2 gallons
Sugar Cubes (for 1 C coffee or tea) - 1 lb box (108 to 126 cubes)
Cream for Coffee - 1 qt yields 62 (1 T. serving)
Ice - 1 (5 lb) bag for about 10 people

*Note on potato salad:
5 lbs = 25 servings
10 lbs = 50 servings
20 lbs = 100 servings
This depends on the amounts of other ingredients in the salad.
3 lbs boiling potatoes (7-8 large)=8 C. cooked & cubed

Some amts above are listed in gallons. When purchasing an item
from the deli, amounts translate this way:

1 pt = 1 lb = serves 2-3
1 qt = 2 lbs = serves 4-6
1/2 gal = 4 lbs = serves 10-12
1 gal = 8 lbs = serves 20-25
(I hope this didn't confuse the issue for you)

Don't forget these amount are for 50, so double them for your
needs. I hope this helps. There is lots more info in this
pamphlet/handout I have. So please feel free to post me & ask.
I'm around on a just about a daily basis & if I haven't posted,
I'm lurking. Just like the rest of us, I'm addicted. Maybe Betsy
will have to start a site for TKL dependency.