I thought I'd update this thread for future searches...
We ended up staying with a friend who ironically lives directly across the street from the KOA! I hadn't been to his new house so it was funny to put it all together. Either campground would be an excellent location for Farm Bureau Live.
As far as FBL, they do have RV parking in "Lot E" for the show. This is not overnight camping type parking but rather for those that drove their RV. Come in the main entrance off Dam Neck and follow the signs to the 2nd parking entrance. You will be pointed to the paved RV parking area which happens to be about 100 yards from the main ticket gate! Awesome location. I'd recommend getting there when parking opens (in our case 2 hours before show time) to ensure you have space. There were 5 other motorhomes there with slides and awnings out having a great time. Getting out was simple, and having your own bathroom was priceless!
As far as the DMB concert, we had lawn seats and it rained almost the entire show. Thankfully we had rain gear so we were happy! We sat near the front of the lawn, met some great people and saw a great show! I highly recommend taking in or renting beach chairs there for lawn seats.
Thanks again to everyone who responded with suggestions.
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