What's the plural form of preperformance? Here's the word you're looking for.
Answer
The noun preperformance can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be preperformance.
However, in more specific contexts, the plural form can also be preperformances e.g. in reference to various types of preperformances
or a collection of preperformances.