Ekim, if you plan on going to the KD you are only going to be able to get into the central area, tickets for seats have been sold out for a very long time.
Only went once, many years ago, and stayed in the middle with the hoards. It was fun but won't do that today. Very crowded, and could not see the races.
Agree with Jennyma, they are so simple to make there is no reason to buy premade.
Usually just take some mint leaves (note: mint in many northern areas will not be up by Derby day, need to find it in the stores), sorta mash them a bit, put them into the glass, add bourbon and simple syrup over crushed ice. Can garnish with a few leaves if you wish.
Have never understood the hoopla about the drink, except it is traditional for the Derby.
Enjoy!