The sentences with incorrect subject-verb agreement that should be corrected are:
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The people who attended the fair was there because they were interested in purchasing artwork.
- Correction: "The people who attended the fair were there because they were interested in purchasing artwork."
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Either the serving platter or the bowl are in the bottom cabinet next to the dishwasher.
- Correction: "Either the serving platter or the bowl is in the bottom cabinet next to the dishwasher."