Right now your best bet is to que on sundays. Awhile back(during HW) some people over on the FF14 reddit started a trend about doing the old alliance raids(which at the time were the CT series) on sundays, and regularly advertising for others to join in and spread the word. I dont know if theyre still advertising for it, but if enough people got into the habit of doing out of date 24 man content on sunday, thats when the ques would be quickest. And if/when the roulette shows up, thatll just make it all much easier.