In a cup, whisk the balsamic vinegar, Dijon mustard, sugar and salt. Whisk in the olive oil and reserve.
Tear the lettuce into bite-sized pieces and spread on a large platter or in a large bowl.
Arrange the eggs, chicken, bacon, avocado, blue cheese and tomatoes in rows, either like the spokes of a wheel or as stripes across the lettuce.
Top with scallions, drizzle with dressing and serve.
