Oh, FFS, Watchtower! Just ALLOW the concession stands to open! You seriously think that people who've had to provide everything themselves are suddenly gonna get real generous near the donation box? Well fed, content people who've had an enjoyable conference experience are FAR more likely to cough up for your cause.
I just hope they have to open the BEER concessions as well. I might have to take in a few sessions then...HIC
The real control thing that annoys me is not "allowing" dubs to leave at lunch time to go out for lunch. I make sure after the sessions to tell my wife were I had lunch out while she was eating her soggy sandwich and half cold coffee.