Candidate #1 Olympic Gymnastics Arena (KSPO Dome)

Case for: Blackpink has held their concerts at the KSPO Dome so it wouldn't be a surprise if they held it there again.
Case against: There's no reason for YG to withhold the name if it was KSPO Dome. ( Also, many netizens in the comments said that the venue is booked during the concert dates.)
Candidate #2 Jamsil Auxilary Stadium

Case for: N/A
Case against: can't do 4 ticket categories as it's just an open field
Candidate #3 Gocheok Sky Dome

Case for: Typical venue for kpop concerts
Case against: Apparently there was a notice sent out earlier in the year that the venue wouldn't not rent out on Sundays
Candidate #4 Jamsil Olympic Stadium

Case for: Enough capacity to meet likely demand
Case against: Stadium is currently scheduled for renovation. Even the disastrous Jamboree wasn't allowed to use it when they needed to relocate.
Candidate #5 Sangam World Cup Stadium

Case for: capacity
Case against: apparently there's a match there on the 17th
Candidate #6 Incheon Munhak Stadium

Case for: capacity, likely available
Case against: It's in Incheon