Probably too late for you fellas to read this, but trust me, you'll have an awesome time.
You picked the better of the two semiannual dates to go... anecdotally, April seems to carry a much higher risk of torrential rain/flooding (at least two of the April shows were canceled for this reason).
If you're driving your own vehicle, get there well before the 7am breakfast line and park as close to the gate as possible, in a spot that looks like it won't become a mud trap if it actually does rain.
Double up on the ear pro - plugs in the ear canals, and external protection, as well.
Get to the "rental range" early if you can - the line gets very long, very quickly, and the inventory of available guns declines as the day wears on due to malfunctions, breakages, etc.
I'm guessing you're either camping there or otherwise have accommodations, but I'd highly recommend Louisville's Seelbach Hilton - lovely early 20th century hotel with a haunted reputation for a bit of extra spice.
Saturday just might be the best day to go - the Night Shoot is quite the spectacle.
When the Show closes, there will be a two hour exodus of vehicles - vendors, line shooters and attendees. I simply milled around the grounds until most of them left, or else I'd just be idling and crawling along...