I am trying to buy tickets for June for the ERA but there is no button to click to move onto the next month. Is there any bug in the website or any other way I can buy the tickets?

Hi, the tickets for June are not released yet.
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Performance Information

ERA2 - Spirit of Shanghai

Venue: Shanghai Circus World
Address: 2266 Gonghexin Road, Jing'an District
Price: ¥280 - 880
Ticket Booking through Wechat Mini App
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Seat Selecting Online