It's supposed to be pretty darn cold here (at least for TN) on Saturday (Hi:34 / Lo:14). This won't affect our ability to have the swap, but everyone should be real careful with the temperatures of your frag tank water. For people buying, keeping your frags warm at the swap and on the way home should be a priority. Bring your coolers (or buy a cheap styrofoam one at Walmart) and be careful if your stand is near a door.
I'd guess that temperature fluctuations are the biggest immediate threat to corals once you take them out of your tank and small bodies of water do not take long to cool down. This may be a no brainer, but everyone buying and selling is trusting that they are getting healthy animals and temperature can make them real unhealthy real fast.