Racing motorcycles is a ton of fun, but requires a good bit of preparation.  It's awful to wait for weeks for a track day, then drive several hours to 
NJMP or 
NYST to find that you've forgotten something essential important or essential.  I've put together the following pack list to remind myself what to bring along to a track day, but maybe you might find it helpful as well.
Track Day Basics
A bike: You should prep your bike and make sure it's running smoothly BEFORE leaving for the track.  If not, you'll fail tech inspection, and not be able to ride.  Most riders 
safety wire parts of the bike that might come loose during a track day, like an oil filter and bolts, which especially if you ride a twin (like a Ducati), often untorque due to vibration.
Riding gear: Most racetracks require full 
leathers (at least zipped together), and though you can rent gear, it won't fit nearly as well as something of your own, and I highly recommend adding a 
back protector if your suit doesn't already equipped. Most tracks also require "gauntlet" style 
gloves and race 
boots, and a decent 
helmet.