Summer Camp Sales By Performance Dashboard

Alright friends. I have a few questions today. 

Hi friends! 

I am working on a Summer Camp Sales Dashboard.

Below is a screenshot.  I am running into a small issue and I am hoping a guru here can help me out!

I highlighted 2 columns below. 

I want to know the Total Capacity of a given performance in the first highlighted column. Then in the second highlighted column, I would love to have the number of unsold seats. Any help would be grand!  


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