On the 17th, 4minute was performing at 'The 1st Pangyo Techno Valley Festival' on October 17, when a ventilation grate underneath concertgoers collapsed, causing the death of 16 and injuring 11 more. 

SEE ALSO: [Update] Concertgoers injured, killed at 'The 1st Pangyo Techno Valley Festival'

Gayoon and HyunA originally had fashion show attendances scheduled for the 19th and 20th. Gayoon was scheduled stand at the photowall for Lucky Chouette's 2015 S/S collection at the Grand Hyatt Seoul Hotel's Grand Ballroom on the 19th, and HyunA was scheduled to be at the photowall for the Stevie J & Yoni P Dongdaemoon Design Plaza on the 20th. 

But after the deaths, the two girls canceled their schedules to show their condolences to those who passed away unfortunately at the event.