I had a few minutes so I gathered seating capacities for all venues (bold indicates a sold out show based on the last tour poster I saw):
- Houston, 713 Music Hall - 5,000
- Dallas, Music Hall at Fair Park - 3,420
- Little Rock, Robinson Center Performance Hall - 2,222
- Birmingham, Alabama Theatre - 2,500
- Knoxville, Tennessee Theatre - 1,631
- Durham, Durham Performing Arts Center - 2,712
- Baltimore, The Lyric Baltimore - 2,564
- Newark, New Jersey Performing Arts Center - Prudential Hall - 3,352
- Atlantic City, Ovation Hall at Ocean Casino Resort - 5,500
- Rochester, Kodak Center - 1,968
- Niagra Falls, Fallsview Casino Resort (OLG Stage) - 5,000
- Flint, Capitol Theatre - 1,500
- Indianapolis, Murat Theatre - 2,675
- Waukegan, Genesee Theatre - 2,403
The total is
42,447, so that would be the most possible if every show sold out.
Update: OK, now I'm spending too much time on this
. So if we add up the sold out shows and credit 100% to the total, it's
23,634. Which leaves a remaining
18,813 possible attendees. Since we don't know what percentage the other shows sold, so we guesstimate. So if you assume the rest of the shows sold at an avg. of 75% of capacity that would be
14,110, which brings the total estimated attendance to
37,744 (obviously it could be higher or lower). All in all, I'd say
@Thewlis estimate of 40,000 was pretty spot on.