Jeffersonville's RiverStage had its biggest crowd ever on Saturday night, as a free concert and great weather brought an estimated 11,000 to 12,000 people to the riverfront. The concert, called "Jeffersonville Goes Country," was headlined by country duo Maddie & Tae, WDRB-TV reports. The Big Four Bridge is bringing more people from both sides of the river to the area, and Jeffersonville Mayor Mike Moore said the concerts are getting bigger each year and they're bringing millions of dollars into…