In Ludum you are able to set the default to all sessions being Not Attending. This is great when you want your athletes and coaches to tell you they are coming.
If you are the club creator or have the ability to edit the clubs details. You are able to set the default setting of all sessions created in the club.
Attending = Athletes & Coaches added to sessions are set to attending
Not Attending = Athletes & Coaches added to sessions are set to not attending
Setting Default for Club
Go to settings
Select My Clubs
Select Edit for the club you have permission for
Pick how you would like to set your default settings for sessions