Hi Antares,
Sorry, I don't think that will be possible. Project wants to sort your group alphabetically, which is why it is using A, B, C. It keeps the location tasks together because they have the same value. It doesn't know anything about the dates as you've not included those in the group definition.
If you group first by location, then by date, you can produce a more logical flow -- but if two tasks have the same start date, it will group then by location.
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