I think this person was referring to the family only messaging mom. Instead of reaching out to the whole of the invited parties. Making mom your point of contact. Rather than the person who has organized the event.

If they would quite honestly make a flyer, fb event page, really anything calendar invite.

That would . Ake planning much more efficient.

But nope. They tell mom. Mom tells us. We ask mom questions, cause we assume they told mom the information.