It’s well done?
It’s quite good, but it’s not unique or great enough to get approved.
You should work more on the typography; A selection of more modern fonts and not “Devil breeze font” that is on most of the flyers nowadays. Also the styles should be more “loud”
The element selection as toivomedia said; its not unique enough it should differentiate itself from the rest of flyers out there. You could try and find a way to display sound waves graphically without the use of speakers.
As for the background its fine but doesnt correlate with the title of the flyer.
The distribution of the text should leave space for icons or logos of the respective dj’s or club.
Hope it helps my constructive criticism.