There will be a tire vendor there that can take care of getting tires mounted in your wheels although you normally take the wheels on/off your bike. Make sure you have the right tools, especially for the front and rear axles.
Brake pads are usually pretty straight forward.
Putting on a new chain at the track, especially for your first day is not something I’d really recommend. Is there a way you can get that done at a shop prior to leaving for the track?
Agree with darth nater, a chain change can take quite awhile, and you'd need someone there with the rivet tool. Just don't overtighten - that's something we commonly see at tech. Whatever the specs are in your owner's manual, put it on the loose side. Are the teeth in good shape?