Troupe Leader's Mask

The Circus Leader's Mask is given to Link by Gorman at the Milk Bar in Majora's Mask. The mask, when worn, will calm angry people. The only time this benefits Link is during the segment of the game in which Link must defend Cremia's milk shipment to get the Romani Mask, as wearing the mask will prevent the bandits from attacking. Bizarrely, the Romani Mask is required to get the Circus Leader's Mask in the first place, and as there is no further reward for defending the milk shipment, the Circus Leader's Mask is essentially an utterly useless mask, being necessary only for obtaining the Fierce Deity's Mask.

Obtaining the Mask
This sidequest can be started after obtaining Romani's Mask, which gives the young hero access to the bar; inside he meets Toto, manager of the Zora band The Indigo-Go's. After Link aids him by playing the pieces of music he requests using the musical instruments of each of his four forms, the man at the bar, Gorman, is moved by the tune. He gives Link the mask to show his gratification.

Trivia

 * This is one of the few masks that can be obtained more than once, along with Couple's Mask.