With the lingering summer warmth and the plethora of garden vegetables at the market, this shoulder season calls for something fresh and light for dinner. But the cooler nights and demanding daily routines that have set in beckon for something comforting and filling that can be made ahead. This soup of fresh corn, succulent crab meat, colorful vegetables and herbs has it all covered. The corn, which gives the soup a golden, hearty base and delightful sweetness, is used in multiple ways here.