False advertising - Bohemian Rhapsody

I cannot explain the disappointment that myself and my friends as well as the crowd around us experienced. The whole Bohemian Rhapsody was falsely advertised. It was advertised that people can come dressed up as there will be prizes, there would be live bands and thereafter the screening of the movie with a sing along.. This was not the case... It was only the screening of the movie... We have watched the movie on box also already... Now we have paid money to watch the movie again.. How can this be...You should have seen how the people where walking out. I need compensation for tickets and outfit. A total waste of our time