It is almost essential (for caving generally, but particularly for Expo) to settle on a particular combination of colours of electrical insulation tape, and label absolutely everything you own with the stuff. The table above shows combinations already taken. For other CUCC colour combinations already in use see CUCC current colours and, if you are really keen on being unique, also check out older cavers' gear colours.
Tape everything, not just your caving gear; while one karabiner looks much like another, it's equally true that one karrimat looks much like another. And especially your phone, phone cable, charger, charger-cable, laptop, mouse, mug/plate/cutlery - essentially anything you want to be reasonably sure to get back.
Geartape lists for CUCC and previous expo years: CUCC, 2019, 2018, 2022.