What concert was Holly planning on going to with Oscar's yoga instructor...before Michael tore up the tickets?
Answer Counting Crows
When Holly hints to Michael that she has no one to go to the Counting Crows concert with her, Michael chivalrously offers to buy the tickets from her. Likely thinking he's offering to go with her, Holly hands them over, only for Michael to tear them up in front of her and say he'll pay her back later.
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