In addition, musicians with ties to the Republican party also play at the event. This is a political rally - most everybody in attendance supports the Republican party in one way or another, and the speakers/musicians are staunch supporters of the party.
Your nephrons filter these substances out of your blood and then reabsorb some of them back into your blood. This keeps your blood composition constant. Excess water and waste products are then secreted as urine. Your kidneys vary the amount of a substance that is reabsorbed into the blood or secreted as urine.
But, if you don't drink much, your kidneys only produce a small amount of concentrated urine, keeping as much water as possible in your body. In 24 hours, your kidneys filter around 150 litres of blood and produce roughly 1.5 litres of urine. Regulating blood pressure.