Good effort Jenna,
chicken - 20lbs.
beef - 20 lbs.
This is enough meat, I might up just a bit and split a little heavier to the beef 18/25 maybe, as beef is usually more popular
shredded cheese - 6 lbs.
OK
refried beans - 7-8 lbs. (raw- will cook up to 3-4 gallons- consider borracho beans for part, esp with black beans, very tasty and more traditional with fajitas)
rice - 7-8 lbs. (raw) good
chips - do not know. corn chips 8 pounds per 100. Not only good with the salsa, but some people will make taco salad instead of fajitas.
salsa - 7 lbs.
tortillas - three per person- might go 4- cheap, and they do freeze. Get part corn.
sour cream - 5 lbs.
pico de gallo - 6 lbs.
quacamole - 5 lbs. , I would probably go 7 pounds on the
All OK , I would probably go 7 pounds on the sour cream and guacamole.
The only thing I would add is a traditional shredded lettuce salad, about 12-15 pounds.