If you are tracking events with Facebook pixel but you aren't able to see the corresponding data for your campaigns, then you are probably in the right place!
If you created events and you are sending the event's info to Facebook, they won't appear automatically on AdEspresso. In order to track them, you will need to create the corresponding custom conversion for each of your events.
If you haven't yet, it's pretty easy to do, just go to the pixel page https://business.facebook.com/ads/manager/pixel/facebook_pixel/, start creating a custom conversion, and then select custom conversion from pixel with the configuration displayed below.
Once this is done, your new custom conversion will appear as selectable at Step 2 for conversions tracking, and will be reported when occurring due to advertising campaigns.