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Details will be forthcoming, but it looks like the extra event on Friday is going to be an endurance race.
4 Classes: P89, ULSB, LWSB, MWSB
Figure a 2.5 hour race going off Friday Afternoon.
It looks like there will be races for most everyone on Friday as well.
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Don't take this is 100%, but at this point I can say that at least the classes and basic structure of the Endurance race are in place to start planning things.