an official performance

[Ashiuhto]

Please help me how to express the following idea:

A dance team constantly kept training and practicing every day. Six momths later, it will give a performance in public. How do we call the show, an official performance or a formal performance?

[freezeframe]

Please help me how to express the following idea:

A dance team constantly kept training and practicing every day. Six months later, it will give a performance in public. How do we call the show, an official performance or a formal performance?

If you mean the first public show (in a series), it's called premiere.