Combine dates and cheese; set aside. Combine vinegar and next 6 ingredients (through garlic), stirring with a whisk. Add arugula to vinaigrette; toss gently to coat. Divide arugula mixture evenly over bread slices. Top each bread slice with 1 rounded tablespoon date mixture and 1 pecan half. Sprinkle red pepper evenly over bread slices. Serve immediately.