Is there a way in the calendar in which we can make it default to only be able to select dates for which data is available and make the rest greyed out so that the dates cannot be selected.
Not in a continuous filter, but you could setup your own calendar on a worksheet where only the days where you have values will be displayed. You could use that worksheet with an action to filter.
Here is an example on one of my old vizzes. You could setup the calendar to be much smaller with some formatting.
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