Plotting a specific date on a graph

[jaolvera]

So I have graph that plots an epi curve with the number of COVID cases per day amongst 2 groups of people, I want to plot a line that would indicate specific dates (dates that control measures were put into place, i.e if during the course of the exposure that the control measures helped or didn't help) how would I got about doing that. here is what my current graph looks like without data.

[#2]

@jaolvera 

Use an XY Scatter chart, with dates as x-values and number of cases as y-values, with lines connecting the data points.

You can then add new series with just two data points each: (specific_date, 0) and (specific  date, 1).

They will be plotted as vertical lines.