If you're staying in a hotel the night before, I suggest packing for any kind of weather that is possible. I always feel better knowing I am prepared for the unexpected. And you can always just leave it in the car if you don't need it.

For packing lists, I do a head-to-toe checklist: what do I need for my head? what do I need for my face, eyes, lips, skin? what do I need for my top? what do I need for my legs? what do I need for my feet? Then I do the morning-to-night checklist: what do I need in order to wake up? what products do I need first thing in the morning (e.g., toothbrush). what do I need for breakfast? etc.