A comma would help clarify: I met your parents a week ago , before the graduation ceremony . It does not tell us precisely when the ceremony was, nor even when the meeting was. All we know is that the meeting happened shortly before the ceremony about 7 days ago.
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Mister MicawberYou are right.I am really really sorry about dragging this question out but I am seriously confused now with this question. So what you meant is that a comma is definitely needed, not optional and there is a meaning difference with or without a comma in the example? So without a comma , it is the same date 100%? I don't think you meant this, ri
Anonymous'I met your parents a week ago, before the graduation ceremony.'I like Mr. Micawber's addition of the comma. The before-phrase only specifies with (slightly) more accuracy the expression a week ago.