Devin Knight continues his Power BI custom visuals series:
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In the Table Heatmap the color of the boxes is determined by the value in your measure. 
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Only 1 category field can be used, which will dynamically generate the number of columns based on the number of distinct values your field has. 
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The number and types of colors can be changed using some of the settings we’ll discuss below. 
I can see the table heatmap being a good visual for calendars.