Toss zucchini with olive oil and salt and pepper and brush corn and bread with olive oil.
Season corn and bread with salt and pepper.
Place corn directly on grill and cook until charred, about 10 minutes total, turning every 2-3 minutes.
Grill zucchini in a grill pan or directly on the grill, about 4 minutes. If grilling directly on grill - use tongs to flip over and grill about 1-2 minutes on each side depending on how thin you sliced your zucchini.
If you have enough room on the grill, you can grill the bread at the same time - about 2-3 minutes on each side, just until there are nice grill marks and the bread is warm.