The plural form for the singular noun performance is performances.
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The noun 'performances' is a plural, common, abstract noun. The noun 'performances' is the plural form of the noun performance; a word for an act of presenting entertainment; a word for the process of carrying out an action, task, or function; a word for a concept.
The possessive form of "the best performance by Sting" is "Sting's best performance".
costumes
The singular possessive is author's. The plural possessive is authors'.
The plural possessive form is actors' association (the association of actors)