Rename organizer to activity owner (#4266)
Rename organizer to activity owner (#4266)

Co-authored-by: Ernst Odolphi <903d00b858ef41d3088a4ef9bd7c516f0ac5b1e7@onepercentclub.com>
onepercentclub/bluebottle,onepercentclub/bluebottle,onepercentclub/bluebottle,onepercentclub/bluebottle,onepercentclub/bluebottle