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I thought I had posted this question, but then it didn't appear (sorry if it show up twice later, i am new)

ok.

Which is correct?

...A luncheon honoring the past president's of the association.

...A luncheon honoring the past presidents of the association.

and why?

we are debating this at my job before we print invitations. HELP!
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A luncheon honoring the past presidents of the association.

President's would mean either:

'President is' or 'of the presidents'

Full explanation here: Apostrophes
Comments  
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thank you for the speedy response. we plan to visit your website frequently.
In your case, I have no doubt: "A luncheon honoring the past presidents of the association."

I did not use apostrophe because I am refering to the presidents that the association has had.