temp the day of?
Absolutely! I'd do everything up until you add the beans the day before (including making the dressing).
Definitely!! But one of the things I love most about this salad is actually keeping the vegetables slightly warm rather than at room temperature, so I might even slight the vegetables back into the oven for 5 minutes if you're able before tossing it with the beans, dressing, and greens and pomegranates!