Dear Sir or Madam works for plural or singular and almost any situation. If you are addressing both sexes, Dear Ladies and Gentlemen or their specific titles, Dear Board of _____, Dear Mr. _____ and Ms. _______.
To all interested parties: Just some examples and ideas.
Two answers, here: 1) Ma'am is a corruption of madam, the French word for lady. Therefore, the plural of madame would be mesdames. If one uses the term mesdames for ladies, then the plural term, in French, for men would be messieurs.2) Ma'am refers to a lady.So, for the plural, you could simply use ladies.
The corresponding term for men, then, would be gentlemen. So, your choices are: Mesdames and Messiuers or Ladies and Gentlmen Of course in the South, the two terms for ladies and gentlemen would be combined by the use of All y'all... but then, I would not choose to use that phrase in formal communications ;-).
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.