If you use the plural form, it's "Symposium on Sheep's, Goats', and Other Non-Cows' Milk.
I'd like to add that the style of capitalization in a title is to capitalize the beginning of all words except little connectors like "and" and "of.
I would use sheep's, goat's and cow's milk.
Sorry for the changes, I gave you the wrong answer earlier.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.