Answer:
Keep a chart with you
Step-by-step explanation:
You could right something along the lines of:
To keep track of the members in the club, I'll(we'll) have them write their names down on a chart so we don't forget. I(we) could also just do a thing where I(we) plan everything out beforehand and I(we) have been keeping track of the members.
You could right something along the lines of:
Since the program is under development, I(we) could tell everyone in the club to put their names on a spreadsheet and I(we) could start developing the program further that way.