1. A media playback system comprising: a first zone comprising one or more first playback devices; a second zone comprising one or more second playback devices; a third zone comprising one or more third playback devices; one or more processors; and tangible, non-transitory, computer-readable media having stored therein instructions executable by the one or more processors to cause the media playback system to perform operations comprising: receiving, via a network interface from a host control device, instructions to configure the media playback system into an event mode, the instructions indicating a zone group configuration for the event mode, the zone group configuration including the first zone and the second zone, wherein the host control device is granted full access to the media playback system; in response to the received instructions to configure the media playback system into event mode, joining the first zone and the second zone into the zone group configuration for the event mode, wherein the first zone and the second zone are configured to play back a queue in synchrony, and wherein the queue is stored in data storage of at least one of the one or more first playback devices and the one or more second playback devices, wherein the zone group configuration excludes the third zone; while in the event mode: connecting one or more guest control devices to the media playback system, wherein the one or more guest control devices are granted limited access to the media playback system; causing display of the queue in a user interface on the host control device and in respective user interfaces on the one or more guest control devices, wherein causing display of the queue comprising sending one or more state variables indicating media items queued in the queue to the host control device and the one or more guest control devices; according to the full access granted to the host control device, causing display of a control interface that includes (a) a full set of playback controls for the zone group configuration in the user interface on the host control device, the full set of playback controls comprising controls to: (i) add media items to the queue, (ii) delete media items from the queue, and (iii) re-order media items within the queue (b) a full set of controls for the third zone; and according to the limited access granted to the one or more guest control devices, causing display of a control interface that includes a limited set of playback controls for only the zone group configuration in the respective user interfaces on the one or more guest control devices, the limited set of playback controls comprising controls to add media items to the queue and excluding controls to: (i) delete media items from the queue, and (ii) re-order media items within the queue.