They're working on it - you can get some backstory by watching William Osman 2 channel. They published a show this year https://www.sauceplus.com/channel/ScareTheCoyote/home then funded the rest mostly with tickets. I'm sure there will be a few side-projects helping here.
TBH William Osman's been pretty open about this event not being profitable yet, though having the support on the YouTube/Sauceplus side, he hopes that will fill in the funding gap.
Trade shows/conferences without a massive corporate sponsorship backing (e.g. like many trade shows today) are definitely risky, financially.