They specified Scottish and Cape Breton style playing
I've been listening to Natalie Haas and Alasdair Fraser and trying to get ideas from her cello playing; I'd gladly take some other listening recommendations if anybody has some!
Hell, if you are capable of getting ideas from HER, you've got nothing to worry about!

One thing to notice is she does a ton of rhythmic chopping. I've been working on more of that - a la Mike Block. My fiddler and cellist say the reason I'm picking it up so quickly is that I never really had good bow technique!
Just go into it with an open mind and a good attitude. A great many fiddlers really are lousy at keeping a steady pace. So figure out what the fiddler wants. You don't need to be the beat cop, but most fiddlers I've played with (including the one I'm married to!) REALLY appreciate a solid rhythm. They fall over themselves to compliment you for doing the simplest thing - keeping it steady.
Also, most fiddler tunes can be made about as complicated - or as simple - as you wish. Just ask for the key and time signature, and start off sticking to long bows or 1-5. In most jams/rehearsals I play in, there is no harm in asking the fiddler to stop the 1st or 2d time through, when you realize you don't know where the song goes. Just ask "What note are you playing there?" I did it just yesterday. One fiddler launched into Tamlin in D, and NONE of the rest of us could figure the 2d chord the first couple times thru. (Turns out it was Bb). I stopped him - he later thanked me. Sure was more fun with us allknowing what we were supposed to be playing!
And if it is crooked, just think of it as an extra 1, 2, however many beats it takes until the rhythm starts up again.
Like I said, bring a good attitude, an eagerness to learn, and have fun. If that isn't enough for the fiddler, then find someone else to have fun with.
(How come, when folk think a tune is modal, they ALWAYS suggest it is mixolydian?)
