Re: "In the memo 'of' October 20"

"Omar" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Can anyone tell me which form is grammatically correct:
> a) "in the memo of October 20"
>   or
> b) "in the memo on October 20"
>
> I always thought that dates followed the prepositions at, on, or in.

Yes, when those are the relevant prepositions. In this case, "of" is the
relevant preposition. A memo isn't "on" a date. Also, "the events of
September 11", "the crash of 1929", and so forth.