Tiara's group faces potential expulsion and must perform an Orchestra.
This anime is available on official platforms like Crunchyroll (linked to a similar series in results for context).
The episode focuses on forming the "LiGHTs" group, strengthening bonds through song, choreography, and costume preparation.
Based on your request, here is information related to Episode 8 of ("LiGHTs"), which appears to be the series you are looking for.
A detailed review of this episode can be found on Chikorita157's Blog . Key Plot Points: