Thinking ahead to Saturday, April 25, I see a need to bring more cardboard with us (step 4 above).
The bed we are getting ready for planting is 35 feet long by 3 1/2 feet wide.
Suppose each of us were to remove the quack grass roots along the log edge, as I described above, for say 10-12 linear feet. Seven club members would be needed to complete the task, each doing a modest amount of labor.
If only 2 or 3 of us show up at the same time, the length of this bed will allow us to keep physically distant.