Dashboard to compare two or more concerts to each other?

I'm lookign to create a dashboard that will show the comparison in ticket sales, revenue, loss of disount, speed of sales, etc, etc for selected concerts ranging over a few years.

Have anyone had to do something like this?

I'm attempting to show the sales trends based on days until performance, but can't seem to get it work properly. It lumps all selected concerts into one line on the graph.

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