By Melissa Clark, The New York Times The sad truth about summer 2020 is that you may not be ushering it in by grilling giant trays of food for a horde of your family and friends. But if you have a grill, you can still use it to make a feast this Memorial Day — though possibly on a somewhat smaller scale. One way to go is a platter of colorful, charred, oily-in-a-good way vegetables. Part of its beauty is that, like so many of the best things these days, a grilled vegetable platter is extremely adaptable.