They set up a meeting this Saturday.
If these elders set up a meeting on their own and informed your friend of the time and place then it's something akin to a judicial hearing, or leading to one. Unless your friend has a compelling reason to attend such a meeting my advice would be to simply ignore the meeting.
If this meeting was set up jointly between your friend and these elders then my advice would be to tell your friend to cancel the meeting saying something like "I don't think I need this meeting and I'll get back with you when I feel like meeting." If your friend meets with these elders they will ask questions your friend might want to answer in direct terms but those answers might cause problems for his family relationship.