There is enough evidence (like a recording or a review) to confirm that this show happened.

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This event was known to have happened, but the specific date is unknown. Usually in cases of rehearsals/recording.

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This event was known to have happened, but the specific location is unknown. Usually in cases of private events.

The full setlist is known and has been verified with a recording.

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No/incomplete recording, but the setlist is entirely or partially known from reviews or articles.

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The setlist is unknown, more common in the early days.