You've got the main things covered, just a few random ones off the top of my head
Cup/thermos cup for a tea/coffee in the morning
A standard waterproof jacket and possibly trousers so you can get out of your bike gear and still walk outside without fear of getting wet.
Camping towel, basically very thin, light weight, small pack size towel so you can dry after a shower.
Big thick plastic bags. Even though panniers, roll bags etc say they are waterproof it easy to spilt stuff and space in smaller bags plus when inside your tent or outside it means you can leave or set stuff on the ground without fear of it getting wet
Comfy camp chair as they may be many an hour spent drinking the beer and talking bikes!!!!!!