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For the 5k, I don’t know what you have for workouts later in the week, but maybe skip an SOS during the second half of the week, run easy that day. Then just do a long warm up and cool down for the Sunday race and kill two birds with one stone.
The 10k will be a good test for the half marathon. Probably use a similar approach during the second half of that week. But you’ll have the work to run a solid 10k already, you just won’t be peaked for it.