Here in TX, almost all of our shows are indoors. With the TX summers as brutal as they are, they really have to be. A couple of (non-NADAC) clubs do outdoor night trials in the summer, and Run As One (new NADAC club) just put on an outdoor show over Memorial Day weekend. Unfortunately, our summers are so hot that you really can't run during the day... it just wouldn't be safe for dogs or humans.
So, down here at least, it is not an indoor/outdoor issue. We all use the same horse barns for our shows. As far as entries go, my club has noticed a drop off in NADAC entries. Every year entries are lower and our NADAC show loses more money than it did the year before. I don't know if other NADAC clubs are experiencing anything similar. There has also been a drop in USDAA entries in Central TX (some shows have been cancelled due to low entries). On the flip side, AKC shows are filling up and have waiting lists.
I think for a lot of folks down here, they are choosing to go to local shows... indoor/outdoor is not an issue for us, but venue (NADAC/USDAA/AKC) and local/out-of-town is. The economy is not that great, and folks have to make choices... and since there are so many AKC shows that don't require a ton of driving/an overnight stay, I think they are drawing bigger entries.
As our entries continue to drop, I do worry about my club's ability to continue to offer a NADAC show... it is getting harder and harder to afford it. =(
-Danielle