When does Reading Drive begins?

And.. is Reestock Wars a annual event? If yes, when it begins?

No, restock wars are not an annual event (in fact I'm not sure if/when there will be another one or when the last one was). There will never be another Reading Drive (also not an annual event, even in the past). There might be other drives in the future, but they will never use books again.

Oh thank you :3 Sure will be.