18.1 is an option Friday or can be done during the Saturday grind (or any open gym).
The workout, scaling options and movement standards are here: https://games.crossfit.com/workouts/open/2018
20 minute AMRAP
8 toes to bar
10 dumbbell hang clean and jerk (50/35)
12 cal row
(a kettle bell can be subbed for a dumbbell unless you are submitting for the open)