Can you filter your collection to show your roster of Special Event cards? The filter categories include the Special Occasions sub category but not the Special Event card sub category.

In the My Collection tab...........

Click on the the 3 lines next to the search box
Select view
Click on Special Event Cards

You can click on the three lines next to the search box (make sure the box is empty).
Then, click on view, and then on 'Special Event Cards'.
You will need a recent version to see this. I am not sure what version if first to show SEC separately.