Whenever you like! I tend to pull recipes in advance; got North Indian food on the menu over the next few days.When do I come over???
I tend to find and stick with a region for a little while, until either I find it doesn't agree with me(I just moved on from a European region for that reason; delicious, but wasn't doing me any good), or the family balks too much. So far, this is digesting well, and the family isn't complaining.