It's not impossible that you might be able to arrange a last-minute, late-night appointment with one of the well-reviewed independent providers, but it's not likely.  Tiffany, the provider who lives in my spare room, won't even answer her business phone after 10:00PM unless someone special has made prior arrangements.

One recommendation is to develop a good relationship with a reputable agency (that sounds like an oxymoron, but it isn't, necessarily).  Establish good relationships with several of the agency's ladies (that means tip them well), and then give the agency a call when your mood strikes.

Another avenue you might take is to arrange some pre-planned appointments with several of the well-reviewed ladies in whom you're interested, and establish a good relationship with them.  Then, after a few nice visits, approach them about their short-notice, late-night availability in your case.

Yes it can be done ..... you'll need to build up a rapport

with some ladies first ... and most likely will have a better chance doing an incall ... after that the agency route is about all that is left you'll be paying extra for your last minute want....

That's the way I am -- spontaneous, spur-of-the-moment --- when it comes time for scheduling an appointment.  It works for me because I have a some favorites that I give repeat business to, and I explain early on that it's how I operate.  If they're not available on a particular call, they just let me know and I move on to the next one on my list, and maybe we'll hookup again next time.