I started organising showcses for my students 11 years ago. I wanted to give all my students the chance to perform in front of an audience and make it feel like a professional gig and provide a platform to hone their skills and get the experience they need to become confident performers. My students use the showcases as goals to showcase what they've been working on. We choose a song and then we practice and arrange the song to fit the students vocal range and style. It's also a chance for my students to use a microphone and to show their hard work to their families and friends.
We usually start practing the choose song 4 weeks before the showcase. On the day of the showcase, we hold a dress rehearsal where everyone gets a chance to go through their song with the PA and microphone. It's also a chance for all my students to meet each other, listen and watch other students performances, get inspired and learn from each others performances.