The night before: Make the cucumber yogurt and let it chill overnight in order for the flavors to marry.
A few hours ahead: Make the cantaloupe drink. The longer you let it sit, the tastier it is. Begin to marinate the chicken, but make sure not to let it sit for too long because the acid in the lemon juice can make it tough. The shirazi salad can be cut ahead of time, but don't dress it until a half hour or so before serving.
Just before serving: Dress shirazi salad and serve rice immediately.