Of course, your average New Orleanian is on a first-name basis with at least half a dozen bartenders by the time s/he turns 21, or in some cases 18, but y'know...
There are even some dry blocks in Houston (the Historic Heights) but in and around Dallas I found alcohol sales to be spotty.
When Lollapalooza played there in the late 1990s (final Ramones tour, and that was the only act I went to see and about the only I remember besides the Shaolin monks exhibition), they played a field near Dallas in a dry county. Anyone who wanted to buy a beer had to buy a "membership" to drink. Why it couldn't have been included WITH the ticket purchase, I don't know (then again, I didn't buy a ticket, I got on the list).