J.
Seventy?! Wow, that's a lot. But I like your challenge - I love trying to come up with ideas that are easy and inexpensive.
- choose a non-meal time and serve appetizers (i.e., 2:00 in the afternoon, 8:00 p.m.)
- if you do a meal, pay close attention to timing and oven/stovetop space. Don't pick things where everything has to be in the oven at once. Con't pick things that have to be assembled at the last minute. Potluck or cater part of it to save time.
- Tacos. This is one of our classic big-group meals on the cheap, and kids all love it. Make a giant spanish rice (or buy in a big tray from a mexican restaurant) buy tortillas at a mexican market, cook up a bunch of refried beans, and cook fajita mix that you can also buy at the grocery store or mexican market butcher counter. Put everything out with condiments and sour cream so people can make their own tacos, also canned corn, nacho chips, guacamole. We get homemade tamales from the local market, steam them in our rice cooker, and then cut into small pieces (about 1.5") with frilly toothpicks as appetizers.
- There is also a fabulous taco dish I had at a party. I don't know the exact recipe, but it was ground beef and onions, potatoes and carrots cubed, slow-cooked with chipotle canned in adobo and water. Awesomely yummy - maybe someone else here has a recipe?
- Ham is easy. Buy bakery bread and make coleslaw. I make my own dressing because coleslaw dressing's so pricey. 2 parts helmanns mayo, 1 part sour cream, season with light-colored vinegar (cider or rice is good), sugar, salt, pepper, dried or fresh tarragon, fresh chives, a bit of chili powder.
- If you do the mostaccioli idea, I make yummy and easy, "cheesy bake." Start with cooked pasta. Add jarred sauce and some (not too much) grated mozzarella and cheddar (or an "italian blend") and parmesan. Pour it in your baking pan and then plop in a few teaspoons of cream cheese here and there in the pan - not too much - about 1/3 or 1/2 of a cream cheese rectangle for a whole 9 x 13 pan. Top off with a very minimal layer of mozzarella to look pretty (not too much or it gets too cheesy.)
- Another idea for a one-dish meal is Jambalaya. You can make ahead of time and heat in a crock pot. If you make it mild, kids love it and you can put whatever meat in it you want (we never use seafood, just chicken and kielbasa, and we also make it vegetarian.) It's inexpensive because it's mostly rice and tomatoes with meat accents.
Have fun! Be sure to post an update with whatever you decided to make.