Be encouraged to visit your local newspaper and ask them to do a story on your student concert. You should also visit social clubs, churches, schools etc and offer them free tickets to the event. This will draw more people to your concert. Also invite local politicians and vips, invite the newspaper to come as well to do a story on the concert.
You should encourage your students family to maybe all bring one "finger food" dish each for the concert during intermission? It is always nice to have this. You should also think about doing something at the end of the concert so the performer and audience can mingle.
You should perhaps also play at the concert, especially if the level of your students is intermediate/beginner. You should also think about what you want to say about each of your students to the audience and perhaps get your students to say something about the pieces that they will play, who the composer is, what the piece is about etc.
Think about decorating the stage too with some flowers or something. Maybe a local florist can sponsor
