"Very Potter Sequel" is a series of fan-made musicals based on the Harry Potter series, created by the group "StarKid". There are three main musicals in the series:
* A Very Potter Musical (2009)
* A Very Potter Sequel (2010)
* A Very Potter Senior Year (2011)
Each musical is a complete story in itself, with a beginning, middle, and end. There are no acts within each individual musical.
It's possible you are thinking of a different work, or perhaps misremembering the title. Could you please provide more context?