Okay, quick breakdown based on knowing next to absolutely nothing....
Bourbon has figured out the fake death, and the concept of psychological manipulation has finally come up which is excellent news for me.
Vermouth however has decided to be a intentionally obstinate to force Bourbon to do some extra work, perhaps because she suspects Conan had a hand in this and doesn't want him or Shiho found out at all costs. Bourbon himself seems to have figured out that is Vermouth's motive because he thinks of Conan right after. So Bourbon heads over to Kudo's house because he remembered that someone from that house gave Conan that cellphone in the cat refrigerated delivery car case. (I can explain this in more detail if anyone asks)
Bourbon, or at least someone who appears to be Bourbon, finds someone who appears to be Okiya in a facemask. The facemask should be a huge red flag. Recall Conan used one to relay to Hattori his Shinichi voice at a distance. In short, the person who is Okiya's voice could be very far away ... perhaps even at an awards ceremony.
We have 9 adults we need to worry about right now who could possibly be in disguise:
These are Bourbon and Vermouth on one side....
And Shuuichi, Kir, Yukiko, Yuusaku, adult Shinichi, adult Shiho, and Masumi Sera. Mostly I would worry about the first four: Shuuichi, Kir, Yukiko, Yuusaku because I think adult Shinichi and adult Shiho are less likely to be involved, and Masumi knows nothing unless they dropped her in last minute. All four of those adults can speak English, and all four have the potential to imitate voices thanks to Agasa's inventions. Watch for high collars!
We could very well have a gambit where Yuusaku (or Yukiko) is home right now in disguise as Okiya, and he is linked to Akai (or Yukiko) who will be picking up the award as Yuusaku live on TV in America because they flew him overseas or something during the 24 hour lead-up time, and they will be exchanging lines about what to say. (Akai being overseas is potentially questionable because if Amuro does something dangerous they aren't really equipped to handle it) As for why anyone would do this plan, it keeps Akai away from Amuro and substitutes in someone who is less likely to respond to psych manipulation, because Yuusaku is a gamebreaker. Also because Okiya and Yuusaku have similar builds, it's possible Yuusaku could do Okiya with just a wig and glasses, making Okiya immune to a face pull.
Vermouth will definitely be hanging around in this and up to something. She might have even warned Conan in advance. Also Conan and Haibs are probably somewhere together, maybe next door at Agasas.
Yukiko is right handed. Yuusaku is ambiguous: he is rather ambidextrous and possibly right handed. Okiya we know is a lefty.
I'll post back if I come up with any better ideas.