I think that a lot of people have hit on this point, but even if you wouldn't normally do much special for a half marathon (or a 10K or even the 5K), you definitely want to reconsider how to handle them when you're putting these races in a row. If you wind up in a deficit from underfueling when you are doing "just" a half, that's one thing. But it's very easy to make a mistake during the early races that you won't even realize is a problem until it bits - hard - on Saturday or Sunday.
But that being said, everyone is an individual and there are absolutely people do well with minimal fuel.