I just saw this today.
http://www.al.com/news/birminghamnews/metro.ssf?/base/news/124678172586800.xml&coll=2
A couple of things stood out to me. For one the attendance is MUCH less than what it was back in the 80's when I attended DC's in B'ham. The article says a little over 5,000 attended. Back in the day it used to be over 10,000. This convention covered the area from Selma, Alabama to Nashville, TN with parts of East Mississippi included. Sounds like the ranks are dwindling.
Also, 42 were dunked and two of the baptised mentioned were teens. One was 15, the other 12. Toward the end of the article it was stated that many Witnesses are raised in the religion. An 18-year-old who was baptised stated that she was "raised in the truth".