Lots of things weren't there. I don't think this was really a meeting of the Supernatural World Powers. I think this was everyone who would accept Baron Marcone's invitation to discuss the Fomor problem in Chicago.
We didn't see the black or jade court, or in fact any Asian or African power at all. Are we supposed to believe that there aren't any supernatural nations in the rest of the world?
Out of the twenty Freeholding Lords under the Accords (per White Night), we just get three -- Marcone, Ferrovax, and Vadderung. No second dragon. No Drakul. No Ukrainian shapeshifter.
Even the powers that did show made a fairly mild showing, for the most part -- Lara came with one valkyrie and five guards. No siblings or cousins. Etri and Evanna came with five guards. Sarissa and Fix came with a few sidhe -- no Eldest Gruff, no Erlking. If you discount the sidhe musicians and einherjar serving drinks, the White Council was the largest single faction with four Senior Councilors and five Wardens.