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Let's say Michael is supposed to attend every party, but there is one specifically so bad, that not even he was in it.

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The use of "not even" is correct. "He was in it" is not.

...that not even he attended.

Additionally, "specifically so bad" doesn't sound at all natural.

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Michael usually attends every party, but there there was one that was so awful that no one, not even he, went to it.

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Comments  

Can paraphrase it? "specifically so bad"

And correct "he was in it" too.

 AlpheccaStars's reply was promoted to an answer.
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Is this correct? (attention: I'm not affirming, just asking) "but there there was one that was so awful."

Two "there"s?

MagnusManrikTwo "there"s?

It's wrong. There should be only one there there.