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You should be able to get the number of actions per EventID by changing the last pill, Action, to a measure (count). However, the filter, as you have set it up, is not going to work. Ideally what you need to do here is combine these two data sets in a JOIN, not a BLEND.
You will need to create a new tableau data source which joins these two data sets together using the common field EventID = OptionalValue
Thanks Robin for your answer