The sound board has a lot of buttons that light up and dials that turn.
Make your own soundboard by gluing the buttons and maybe paint them. I think MiNDY said add Christmas style lights?
To make is more realistic, use a broken old computer or make a screen from a box lid. Put your playlist on the screen
Get some earmuffs or big headphones.
Get some music:
Get some listeners (family, friends, stuffed animals).
Get a phone, but not one that rings loud, so you can take requests.
For a microphone, you could use a brush or a toilet paper tube with a golf ball glued on top.
Get some guests, too!