Thanks for reaching out about this! You are correct in that the Deleted trashcan combines all types of campaigns without a way to filter. I can definitely provide this feedback to our programmers, but in the meantime you can create a specific folder for these Event campaigns, and move them there rather than to the Deleted trashcan:
It would be an easy way to find the exact Event campaign you need!
Hi @JohnM03! Here is a link to our Help Center that will show you how to create a new folder for your campaigns. Also here's a quick screenshot that shows you to click on the plus sign to create that folder.