According to Official Guinness Records,
The largest audience for a technology product launch event is 23,152 people and was achieved by Smartisan Digital Co., Ltd (China) at the National Stadium, Beijing, China, on 15 May 2018.This event celebrated the company's 6 years anniversary and the Smartisan R1 mobile phone was also launched at the event.
For a complete list of 2018 records, please visit 2018 Guinness Records in China.