You can email this address -
WDW.Guest.Communications@disneyworld.com to request ASL interpreter schedules, but they only do them two weeks in advance. It seems like the park days stay the same but they change up the times sometimes. I kept requesting them every two weeks to make sure my FPs would match up, ADRs, etc. The MK times changed last week and I go next week, eep! But I think I'm all okay now
You also can contact them to arrange interpreters for attractions not offered already but they've covered like all attractions/shows that can be interpreted. I requested one for the safari in AK and while it's not set up for interpreters (they're working on adding jump seats), I told them I'd sit next to the terp so they agreed to allow me to do that. Will see how that turns out. Another one of my requests was to do Jungle Cruise two times in a row with different skippers since they don't follow the same script which they allowed (still hearing back on which one of my MK days that'll happen).
This goes for special tours and etc too. I'm doing DiveQuest and I'll have one for the backstage portion and all above ground communication as I don't really have any issues with underwater communication
You can request an interpreter for dining shows such as the luau but not for character meals as "communication not essential to interact with characters" (I did argue with them on that about princess meals).
DEFINITELY go to the parades that are interpreted as you'll get a pretty nice standing area, roped off for your use and the terps do a great job & parade performers know where the interpreters are so some will do the ILY sign towards you and omg, this made my entire holiday - there was a Mr Smee who ran up to me, introduced himself in ASL and said nice to meet you before he had to run off! I left a kudos card or whatever they're called for him because AHH!
Once you're there, you can ask the interpreters about any other cool stuff for deafies while you're there. DLR has a Flik who's deaf and he just happened to be working the next day and I found him! They knew of some other characters who were deaf/knew ASL but none were working when I was there. I did meet a "friend" of Anna who went to some of the interpreted shows/rides as extra credit for her ASL courses. No idea about WDW but I'll be there next week so...
The blue box (captioning device, I just call it blue box because it's blue) is annoying as you have to pick it up daily and return it at the same park unless if you're at DLR where the box can be used in both parks, but some of the tips they gave me was to use cash deposit so when you return it, it's a breeze to do so.
Here's a photo of it in action at DLR Pirates. It's dark so you can't see what the box looks like but as you can see, it's bright so you can see it in the darkest rides. Some of the rides had terrible captioning (DLR Star Tours was horrible) but then others were amazing and had some hilarious moments such as the pic I attached.
It's sort of the size of a bulky thick phone and it comes with a lanyard so if you want to look like a dork, you can wear it that way. I did that because it was easier than digging through my pack on a hot day and when CMs see you with the box, they'll point you towards TVs with captioning enabled. They tend to have a black & white "CC" icon on the set itself and can be out of the way/often not one of the main TV sets. It'll vibrate when you're on a ride that's compatible with it and start up but sometimes it'd turn off randomly during the ride??? then it'd vibrate again as it turned itself back on -_- You can leave feedback about it, I did for that particular ride (Little Mermaid at CA) because it was so awful.
Never tried to get the schedules in paper while at WDW but I got them at DLR when I went to guest services for the blue box.
If you PM me, I'll be able to help you out with more information that I'm not sure if I can post publicly