Ask anyone who has ever had to carry a butcher’s bag of random meats home on a night bus: the tombola can be a cruel mistress. Declaring Yard Act’s intention to rediscover the spontaneity lost since “things changed” to the tune of 5,000 tickets a night, the singer James Smith hands a tray of numbered ping-pong balls into the crowd to select the night’s first three songs from a prize board of 20.