Most obvious thing is your shoes. Did you have your gait analysed and select a pair based on this, or did you just pick up a pair from a sports outlet etc?
As its only happening after longer distances it might be that you are lacking endurance at the moment and as your body tires, your running style is affected and this stresses your calves more than they are accustomed to. So it may disappear as your endurance improves.
I think a trip to a physio may be beneficial as they can look at you bio-mechanics and spot if there is a problem, and hopefully give you exercises to address it.
Too much, too soon, too fast. If you can do 7.5 miles, and you have 6.2 to do in the race, why worry? Relax, slow down, stick with as many 4 milers as you can before the day and the accumulated miles will get you thorugh easy, whilst still building your endurance.
Better to not break the hour this time (you will if you persist), than "break" your calves and lose training.
I wouldn't go by brown paper and wet foot! If you go to a decent running shop like sweatshop, or whatever is near to you, they will be able to do a gait analysis - I think in the weatshop near me they have a camera and film you running on a treadmill. They can advise you which shoes would be suitable and you can take it from there
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