I don't think that there is one artist that performed at the former l'Intercontinental (later also known as Grand Hotel Kinshasa and nowadays Pullman) like Koffi Olomide. In one year he could perform there 4 times. He started performing there in 1987.

Yeah I don’t think I’ve ever seen GHK so packed and singing along well here in 1999

That was because that day it was all free for women. If I remember well it was called "Soireé des Divas". The hall was so packed that Koffi planned a new event at GHK the next week, for all women who couldn't attend the previous concert, that concert also free for all women.