Attacks, creatures can attack the clan and can appear when the border is at less than full. They get more and more common the lower the border is.

Natural disasters, not all natural disasters affect the clan but some can affect them in a negative way.

Moons where they worship something, I'm to lazy to find them all out but they are an event.

Petal and Flame, these are two sibling rouges that sometimes come to the clan. When they come it is randomized what each of them do. Petal is more likely to help the clan in some way while Flame is more likely to do something to the clan cats.

I think that's all tell me if I missed anything.