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 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, among...