Its crazy how fast sometimes the SPs are booked when the schedules go live. I don't recall this being such a thing in the early 2010s. I do think the incall business is in huge part the reason. Its much easier to simply reserve your spot and not have to worry to get an hotel room or host at your home etc, just show up at the incall and thats it. Then again we still in "summer time" (not really but i mean its still sunny and rather hot, heck for me its even better than the actual summer as i am no fan of the heat lol). Its probably gonna be easier to book during January and Febuary.
Personally i did do the "refresh page" every 5 mins a few times

Especially with Euphoria since its only 1 day in advance. Forever does have a few SPs booking uber fast days in advance tough as well tough. There was a thread on this in the 411 but it got lock fast (cause Forever answered) but funny enough i think i only saw Chloe with oppenings like once or twice. Rest of the time she get on schedule BOOM its fully book as soon as i see it. I don't "actively pursue" meeting her myself at this moment but its just something i noticed.