Thanks guys,
I was thinking a mild, a medium and a hot... korma/CTM/madras, give them the choice of which one they want to make and split them into groups based on this when they're at that stage. They can all contribute towards the gravy and then divide it up as I'm not sure how I would scale down to them each making a portion of gravy for themselves. Veg pakoras with sauce, naan and pilau rice. Job done!
Makes it sound so easy when I put it like that eh? ;D
Open to suggestions or alternatives of course - has anyone done similar tuition that could give me some pointers?