Postshow Attendance compared to Show Attendance

Hi Y'all, 

If there is documentation for this somewhere, just point me in the right direction, but I've given up my search. 

I want to compare the number of constituents that attended a show to the number that attended the post-show talkback -- ideally within the same pivot table. I have already isolated the post-show constituents into a list, and I can pull that into analytics. However, I am curious if I can compare the two attendance rates in the same widget. 

Is a Multi-Pass Aggregation the way to do this? It feels like it is, but I cannot get the formula right. Here is what I have now:

Sum([Constituent ID], IF ([Lists2] = 1, 1, 0)) 

Any and all help is appreciated! Thank you so much :) 

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