Set up your account/device as a jukebox, where users can find (perhaps by location) and submit to your device songs which will be added to a playlist on that device. Perhaps secured by a simple passphrase which can be printed and displayed/emailed/texted to people in the area, and prevent "drive by play listing".
Please bear in mind that the Community is not an official Spotify support service. It's a place where we all help each other, whether we work for Spotify or not. So please use your discretion when using the forum.