I don't have time at the moment to read the links GTF is offering but, given the location, I'm sure they offer some very sound advice that I wouldn't want to (and hope I don't) disagree with. I'll be sure to read them later and I hope to find that what I'm about to state doesn't contradict what is stated there.
A couple of comments based on my personal experience.
First, the taper. While three weeks works for many people, especially after a very long period of intense training, I've actually found that a 10-14 day taper works better for myself personally. I just think three weeks is too long for me. Given the fact that you already tapered it sounds like for 3 weeks for Lakefront and then probably took some recovery time after Lakefront, you probably don't need another full 3 week taper this time around. I'd at least consider shortening it to 2 weeks.
Second, the pasta thing. Yes, we should make sure we get plenty of good carbs but I'm still a proponent of a balanced diet. Mix a little chicken or turkey into your spaghetti sauce and top it with some parmesean cheese. It will taste much better and be more filling, while still getting you a good amount of carbs. It will also give you some protein, which a runner shouldn't skimp on at any point in time.
