The day before yesterday's session.

"The day before yesterday's session."

Please check.

If today is Tuesday, write The session we had/attended the day before yesterday. Possessives on noun phrases like day before yesterday​ are awkward and hard to understand.

Note that neither your version nor GoesStation's is a complete sentence.

"The session that we attended day before yesterday or Monday session."

tufguy said:

"The session that we attended day before yesterday or Monday session."

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Can you use that phrase in a sentence? You can write one sentence with each variation if you want advice on which one to choose.

And please, please, find a way to avoid using 'or something else' in your sentences. Put brackets around it, make it a different colour, whatever - don't make it part of the sentence. It just doesn't help in understanding your sentences. (Maybe that's what GS is saying.)

"The session that we attended day before yesterday."

"Did you attend the Monday session?"

tufguy said:

"The session that we attended the day before yesterday." ​Even with my correction, this is not a complete sentence. Please write another.

"Did you attend the Monday session?" :tick:

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See above.

emsr2d2 said:

See above.

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"Do you remember the session that we attended the day before yesterday?"

Did you really manage to miss the correction I made in bold and red in post #8? Please add the missing word and use the correct punctuation mark at the end of a question.

emsr2d2 said:

Did you really manage to miss the correction I made in bold and red in post #8? Please add the missing word and use the correct punctuation mark at the end of a question.

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No, I was still amending it but you posted this.

So you can see how important it is to check that your posts are correct before you actually post them!

tufguy said:

"Do you remember, the session that we attended the day before yesterday?"

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Why on earth did you add a comma?