In a bowl, combine first six ingredients. Chill for at least 1 hour.
Cut a 1-1/2" slice off the top of the loaf; set aside. Hollow out the
bottom part, leaving a thick shell. Cut or tear the slice from the
top of the loaf and the bread from inside into bite-size pieces. Fill
the shell with dip; set on a large platter. Arrange the bread pieces
and vegetables around it and serve immediately.