The most straight forward way is to have a reveal widget that shows the list of everything when 'all' is selected, and shows the list for the specific tag when any other option is selected. You may also be able to make a macro that returns tag[SomeSchool] when the field isn't 'all' and returns an empty string when the field is 'all'. It is too late for me to think about the second option too much now. I think I have some example in one of the plugins I made. I may remember in the morning.
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