Hong Kong’s M+ museum has offered ticket holders one free entry in the next three months after poor crowd management led to hours-long queues for an exhibition that opened at the weekend, prompting a wave of customer complaints. The venue’s “Design Ah! Experience the Wonder of Everyday Design” exhibition in the West Kowloon Cultural District drew thousands of visitors on Sunday, who paid either HK$190 (US$24) for a standard price ticket or HK$400 for a combo admitting two adults and one child,...