Planning with people who don't live in the same household.
In cross-family groups, share calendars and lists with exactly the people who belong there.
Shared plans never reach everyone involved.
Whatever is in the group, every member sees – without needing access to your household.
The training schedule shouldn't flood the family calendar.
Group events run as their own layer in the calendar with their own colour, and you decide whether all members can add events or only the group's admins.