Its supposed to be on around the 12-14 July mark i think.
And from what iv heard, drivers have to go through a light scrutiny to make sure cars are safe enough on track and get an approval sticker or something.
Then drivers have to attend some trackday briefing
And once all past, you pay something like €60/70 each day to drift as long as you want. (must bring your own tyres and pay for your own fuel obviously)