Report/Widget to view upcoming performances which portfolio members will be attending

Hi all.

I'm trying to figure out how to best create dashboard/widget that would show me the number of people in a portfolio that are attending a concert and who those people are. The idea is to make it easier for gift officers to decide which concerts to prioritize attending without having to explore individual records. I know that there is the column option within the portfolio page, but that doesn't give an overview, only the constituents' next performances. I'd like something that makes it easy to plan out weeks or even months in advance. 

I currently have a pivot table set up showing the performances/date with the value being the constituent number which is filtered to a dynamic list, but I still have to go refresh the list in list manager and then wait overnight for any changes to take place. Does anyone have any suggestions for a better way of doing this?  

Thanks!