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.
That's a lot like if you're pregnant, and the baby is squishing your bladder so much that you have to pee all the time. The process works like this: First, the water has to be absorbed into your bloodstream from your stomach and intestines (which can absorb about 1/4 Liter about every 15 minutes). Then, assuming you were already at optimal hydration levels, your kidneys would notice that there's more blood coming to them (because of the greater volume of fluid in the blood).