This is a super neat idea!! One thought I had was more ways to balance clan size, since it's very easy for them to get very huge. Maybe have no hard limit, but make it so at a certain point it's increasingly easier for sickness to spread, maybe prey becomes sparse, etc. Maybe also making it so the chance of an event happening is chances per cat, rather than a chance of a certain event happening per moon regardless of clan size, if that makes any sense