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Is there any reason you're using the event to send the email? You can simply put the results into a table, for example, then use the email tool to send the email (be sure to download @DavidM 's macro that uses authentication if you're using 365 or suchlike.)
If you have a reason to use the events, then yes, output the data in the format you want, such as a .csv, to the desired location, then use the event. In the event setup window, click "Add":
Here, click the plus sign and browse to where you saved the attachment.
This will work providing you have set the event to trigger AFTER the workflow has completed, as this will include the output of that file.