The two day ticket I believe includes the pit party no matter where you sit, although depending on where you're sitting there's some special stuff that you usually received from previous years' Double Down packages such as a track walk on Friday, exclusive memorabilia, etc, but you now get those if you bought seats in the middle sections only. I'd suggest going to the pit party on Friday, getting there early and just enjoying it for the day. I didn't go to the Friday and Saturday pit parties back in 2016, just used those days to see some stuff and just relax. It's all up to you though, way easier now to go to both days since it's not a three day deal anymore.