As Axe as stated i have made curries for a local college and a couple of functions for about the same amount of people.
For instance i have used this recipe for CTM
https://curry-recipes.co.uk/curry/index.php?topic=1823.0This recipe fro me made about 8-10 servings.I made the whole lot from start to finish but didnt add any chicken, precook the chicken tikka easier to just warm through than cook from scratch with everything else you have to do.
For the madras have use this recipe
https://curry-recipes.co.uk/curry/index.php?topic=674.0again for about 8-10 servings, just precook all your meat.
As for the bhajis etc make in advance then warm through in an oven.
That is what i did just precooked everything then just heated through at the venue.
I made
Onion salad, tomato and coriander salad, spicy onion salad
Cauliflower paratha, potato paratha and plain paratha
Naans
Onion Bhajis
Carrot, red pepper, green pepper, courgette, and mushroom pakoras
sheesh Kebab, Shami Kebab
Lamb tikka and chicken tikka
CTM
Chicken Madras
Chicken Dopiaza
Chicken Dhansak
Balti Madras
Balti Dopiaza