I have checked the concert schedule of Harry Styles, who has taken over BTS' position as the top act of the world
He goes to various stadiums around the world, but not all stadiums are created equal and while he goes to big stadiums in Europe like Paris and Munich, he does not go to the Tokyo Dome in Japan (he goes to the Ariake arena, capacity 15,000) and in K-O-R-E-A he goes to the KSPO dome (capacity 11,000) for 1 day.
IN usa he mostly toured arenas , around 15,000 capacity , although he toured more cities.
===
To my memory, the only person who was a member of a group and still had a huge concert is GDragon.
The late Jonghyun and Jung Eunji had individual concerts but they were small matters. Jonghyun's final concert, a week before he died, was held in the Handball arena (capacity 5,000). Jung Eunji's concert had a few hundred capacity.
There are others, like Taemin, but I can't count them all.
GDragon was able to have such huge concerts because Mr. YG liked GD a lot. Also GD had the power to draw a lot of crowd.
However, those were the days and from 3rd Gen companies are wary of a single member charging thru.
Given the strange situation of BTS, I wonder what would be the expectation on their concerts. Will they be able to do big ones, or will they have to settle for smaller ones?
In the normal times, Jonghyun's 5,000 concert would have been seen as respectable, and KSPO Dome, where Harry Styles has settled for, would be considered as a huge achievement.
However,
This has really cast a huge onus on individual BTS members, especially Suga who could have refused the false surrender offer from Lee Jieun to avoid this situation from occurring.
They have to beat this
to prevent detractors from saying the parts of BTS are not as good as the sum.
They now have to start from KSPO dome, because of the city authorities of Seoul who allowed a nonKPopper to hold a concert in Korea's largest venue.
that's 
