"The prom" is as hypocritical, opportunistic, manipulative as the characters that it wants to criticize.
Always too busy trying to be appreciable, recognized, praised for his commitment to the good cause, trying to appear good, innocent and honest (and to include as many product placement as possible) that it neglects everything else with extreme superficiality: from the two-dimensional and stereotypical characters and the mediocre choreographie to the repetitive, forgettable and corny songs.
Nothing really works, not even Meryl Streep can save it and at the end it's difficult to ignore the sneaky intentions behind the shiny lights and the glossy colors.