Food Quantity for My backyard party?

Last year I overcooked for my July 4th, spent the entire day behind the grills and barely hung out with friends. So I'm doing 4 - 9 (when it gets dark, fireworks show happens).

Need help with quantities. Here's my menu:
starters (serve @ 5 pm): chicken legs, pork tenderloins
main course (@ 5:30): salmon, flank, spare ribs (+ hot dogs for kids)
sides: beans, asparagus, cole slaw
45 adults, 27 kids (ages 3 - 12); it's mostly a drinking crowd, if that means anything.

Questions:
1. How do I factor in kids' appetites?
2. What's an appropriate number of chicken legs to provide each person?
3. Pork tenderloin is the large cut, getting from Costco: I am slicing them about one-half inch thick. What's the number I should have for everyone?
4. For dinner, salmon will be cut and served about 1.5" wide, and I'm making enough for all adults to have 1 (even though we don't have all fish eaters). Same too re the flank, only will cut into 1" wide strips. So for spare ribs, is there a number I should go with?

As always, advice is greatly appreciated!

NBBD said:

We plan for 3-4 servings per rack of spares when cooking for a group when there are lots of other food choices and figure that 2 kids between ages 6-12= 1 adult for planning...

My wife and I always have trouble figuring out quantites and started using the catering excel spreadsheets to help us out. We have also gotten to the point where we are tired of cooking all day and missing out on the party so we now try to serve mostly foods we can prep the day before Stuffed Shells, Pulled Pork from the smoker, and quick grillers to round it out. We will sometimes smoke ribs instead of pulled pork because its an easier smoke and has some wow factor to the family and friends...

Have fun and be safe this weekend! Are you doing the fireworks show or is a community thing...

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NBBD, the "catering excel spreadsheets"? Is there such a thing or are you doing your own? Fireworks show is courtesy of a lifelong friend who puts on a 60-minute show that's just awesome. And all the neighbors are invited so nobody complains!

Sparky said:

I found this one Catering Excel Spreadsheet it is pretty complete.

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Thanks, will check it out!