Answer:
Well, it would depend on how many people. A party consists of 5 to 100's people. Then you also got to figure out how much each batch of cookies makes. It can vary on side of the cookie or the number of ingredients. So, if you need to make 4 batches of cookies, this is what you'll need:
2x4= 8
1x4= 4 teaspoons baking powder
1x4= 4 teaspoon baking soda
1x4= 4
3x4= 12 teaspoons salt
3x4= 12
4x4= 16 cups softened butter
1x4= 4
1x4= 4
cup peanut butter 4
1x4= 4
cup each granulated sugar 2
1x4= 4
5x4= 20 cups packed brown sugar
2x4= 8 whole eggs
1x4= 4 teaspoon vanilla
That's how it should be. Though, if I missed read this, I do apologize. Also, here are some fractions for it, just in case there were some fractions.
1/2x4= 2 or 4/2= 2
1/3x4= 1 1/3 or 4/3= 1 1/3
1/4x4= 1 or 4/4= 1
1/5x4= 4/5 or 4/5= 4/5
I hope this helped.