Layers and a change of clothes.
Grab some bike shorts. You'll thank us later.
Sneakers and/or cycling shoes with SPD clips.
Comfy shoes for when you are not on the bike.
Refillable water bottle to stay hydrated (water is provided).
Chairs, cots, a sleeping bag, etc. Whatever you need to make your team area comfortable for the long haul.
Phone and charger to share, take selfies, (recruit more peeps?) and

show the world you took on Ruff Ride!