Prepare the hummus. In a food processor, combine the chickpeas, sundried tomatoes, basil, garlic, lemon juice, tahini, cumin, olive oil, salt and pepper. Blitz until smooth, adding water 1 tablespoon at a time to reach desired texture. Taste for seasonings. Scoop into a bowl with a spatula and set, covered, into the fridge while you prepare the rest of the board.
To make the grilled vegetable skewers: whisk together the balsamic, olive oil, oregano, basil, rosemary, garlic, red pepper flakes, and a pinch of salt and pepper. Add sliced veggies to a large bowl or ziptop bag and pour marinade overtop. Toss to combine. Let sit at room temperature for 10-15 minutes.
Preheat grill or grill pan to medium heat and spray grates with oil. Thread veggies onto wooden skewers, alternating squashes and bell peppers. If you're doing steak, make skewers of these as well.
Grill veggies, covered, for about 10 minutes, turning every couple minutes to char each side. If doing steak as well, grill for 8-10 minutes also, turning every couple minutes, until desired doneness is achieved. If you're using a grill pan, keep in mind that you likely need multiple batches and cook time will increase.
To assemble the board: Set skewers on one side of a large charcuterie board. Add bowls of hummus and tabbouli to the center and arrange blue cheese and feta cheese around the bowls. Set a small bowl of artichokes and olives around the perimeter. Fill in empty spaces with figs, grapes, and dolmas. Set pita loaves or triangles in remaining spaces.