A pair of posts by Apple-centric bloggers John Gruber and Jim Dalrymple suggest that Apple may be planning to introduce the next-generation iPhone and a smaller iPad at separate events in September and October. In a post, Gruber remarked that Apple wouldn’t likely want reviews of the new devices to appear at the same time, thus competing against one other for media attention. “I’m thinking it makes more sense for Apple to hold two events.…