"I know optimally you should have
-oil change before and after the track day
-pads changed to a harder compound
-dedicated track rims/tires
-removing all the crap you dont need at home or on site (spare, jack, luggage, etc)"
I would only change the oil if it needs changing. Check to make sure you have enough oil in there though. Changing the oil after the track day is a good idea though as you will be quite hard on the engine.
You don't necesarily need to change brake pads, and, changing them just for track and back to stock pads for street use is a bad idea (pretty sure it is bad for your rotors, and also, you will temporarily lose some braking power. Just keep the track pads in there, or get some high performance street ones for daily and track use. The stock brakes work plenty well for a track day. I would bleed the brake fluid, but make sure you have someone who knows exactly what they are doing, because, your life is on the line. Though bleeding the brakes is not necessary, just a precaution.
Test fit your track tires/wheels at home and make sure there is no rubbing when the damper is fully compressed. Depending on the size of the tire you may need to roll your fenders, I have 205 width Azenis and I had to.
Take your jack and spare to the track and you can just leave it in the pits when you go out on track, if crap happens on the way to the track or going back home you will be glad you did.
Depending on who is putting on the track day event, they will have you fill out a supplied form that you will need to fill out that basically affirms that your car is ready for track duty - battery secure, check, hub bearings don't have any play, check, oil level, check, ETC. For your safety and others. Plus, they don't want the track ruined by your fluids.
These forms are available at
SpeedVentures - Track Events for Everyone!.
Bring lots of water, food, a folding chair, your basic tools (torque wrench for your wheels and tires at the track).
Have fun.