Start off by offering no fees for Spotify Premium members. Charge the event organizers the fee, or take it as a loss leader initially. The value add of Spotify

Start off by offering no fees for Spotify Premium members. Charge the event organizers the fee, or take it as a loss leader initially. The value add of Spotify is an unique avenue for promotion (e.g. visual displays of upcoming concerts when playing similar songs, which users are unlikely to see as intrusive ads).