Are all of the club members also living in your sim's household?
Sims will not autonomously start writing a novel, at least that's been the case even with my active sims.
Even with maxed Writing skill, the most my active sims will do autonomously is "Practice Writing."
If I direct active sims to write novels, once they're done with that, they'll either practice writing, browse the web, or troll teh forums.
That's just been my experience, though...