It's my grandmother's recipe which I always use, but I'm doing it in Saturday for 60 people for my Mother in law's 70th birthday lunch. The recipe is very basic and consists of curry paste, mango chutney, full fat Greek yoghurt and full fat mayonnaise. I was hoping to make up the sauce on Thursday morning and refrigerate, to mix with the cooked chicken on Friday. That should be fine, shouldn't it?