Can the "next normal" Ravage or Build be on a future turn?

Can the "next normal" Ravage or Build be on a future turn?

Yes.
If the Ravage or Build Space is empty, or if the Invader Card in that space has been changed into a different type of Invader Card (e.g., the next normal Ravage Card becoming a Build Card) leave the relevant Event Card in that space until the effect has a chance to apply.