Party host makes me think of this role that can once in the game stop all night actions, maybe at the cost of revealing their identity. I know this role has appeared in other games here and I know there was a similar role in Amber's last game. It's more likely this is just a mayor role.
I don't think the messenger can contact multiple people, my guess is that the conversationalist (gossiper?) or the storyteller (penguin?) contacted one of you.
The maid does sound like the Old Maid role, "She yearns for freedom from the manor though and will seize it the instant it arrises.", I think it's pretty obvious too. Baker role is something we haven't had in any game here so far as far as I'm aware of so I doubt it's that. Nicki if you are the old maid please dont steal my wincon again :cri:
Mis-matcher sounds like this one role that will appear as guilty, but I think breakfast might be right too since the name of the game "Masquerain Mafia Madness" and Amber's history as a host make me think that it's likely that some kind of chaotic role swapper role exists. That kinda explains the helper role and why is it related to the physician.
Ok scratch the part about the mis-matcher potentially being the role that appears as guilty, that's probably the worrywart.... or maybe thats the disgruntled person. The disgruntled person could potentially be some kind of vigilante.
The distracter is definitely a roleblocker and I doubt there would be two of those in one game.