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I tried this just now, when I add data series 2 as "Events" and put the X values as the dates of the events, then set the y values to "1", I just get a single dot in the wrong spot on the graph. I also have an extra X axis on top of the graph, and another one to the right side, so I'm not having an easy time of it! This is strange because treemaps, pie charts and a plain line chart never trip me up.
– C Bauer
Commented Mar 5, 2018 at 19:07
You have to have two data points to form a line. So you have to have the data arranged as I have shown. When you add the series, enter the range for the x-values for Series2 as (for example) A:15:A16 and the y-values as B15:B16. But use the appropriate ranges for where your data is located.
– Bandersnatch
Commented Mar 5, 2018 at 19:15
Note this has to be a scatter graph for the added series to line up with the correct dates. It's OK for the events to be on a separate sheet.
– Bandersnatch
Commented Mar 5, 2018 at 19:20

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