We have monthly patio parties 'during the season' which is starting soon as many of our Northern snowbirds are returning for the winter. We usually get about 50, also. I don't worry too much about if my contribution is enough to feed everyone. There is usually a wide assortment brought. It amazes me how many go to the grocery store to purchase their dish and don't even go to the trouble to put it on a nice plate or platter.
But as long as everyone has a good time it really doesn't matter. It's more for the 'social community' that we hold these monthly events.
One time I made 'Walking Taco's'....individual bags of Frito Corn Chips (sold at Sam's Club or Costco in a 50 bag carton), crush the chips a bit before opening, then spoon on hot taco meat (kept warm in a crock pot) and then add toppings ~ onions, cheese, tomato, sour cream, lettuce etc. Those went over really well AFTER I explained the process. I even printed out a sheet of 'instructions' and placed it in a picture frame on the buffet table. LOL
Oh, for those of you who aren't familiar with these, the bag the Fritos come in is the 'dish' you eat your 'Walking Taco' from. No need for a plate or bowl, just a spoon, fork or SPORK.