Hi!
I think we should go with the UTC version. Remember if we do 3/29 in our own time zones, we effectively have 48 hours of photographs instead of 24 (some guy in the western Pacific takes a photograph at what is effectively 12:01 UTC on the 28th (00:01 AM on the 29th local time but 12 hours ahead of Greenwich) and some other guy in the eastern Pacific will take a shot at 11:59 UTC on the 30th (23:59 PM on the 29th local time but he's 12 hours behind) . This basically makes it "two days in the life of America", not one. I was hoping to get all the photographs taken in the same 24 hour period.
Other comments:
1. We should probably make sure we've got people from all over the world. If everyone's in the US it doesn't do much good
2. When it comes to taking pictures of people, we should probably follow the "Prime Directive" and make sure that the people we're photographing do not change what they're doing if they know they're going to be photographed. If you've got a lot of people in your shot it could probably be taken candidly since you're not focusing on any individual person.
3. Don't take pictures of people whose cultural or religious traditions prohibit them from being photographed (Amish, for instance).
4. Try to record the times the photographs were taken. You can convert to UTC later. If you're not sure when exactly the 24-hour interval starts for your area, you can take a few shots an hour or so on either side to make sure you've got the whole interval covered if need be (though keep in mind that if any pictures wind up on the 28th or 30th UTC they won't count)
5. I just had another crazy idea. At 12:00 noon UTC on the 29th -- exactly midway through the session -- everyone take a picture of what they're doing. It doesn't need a theme or anything like that. Just basically a snapshot of where you are and what you are doing. This will give us a whole bunch of photographs taken at exactly the same INSTANT all over the world
A friend of mine just told me she's going to help out -- and it turns out that on the 29th she's going to be on an Outward Bound program in the mountains of North Carolina. That's something you don't see often.