How to recover deleted Calendar events on iPhone 12 Pro Max?

Is there a way to recover deleted events? My calendar keeps deleting my events. Is there a trash that it goes to I can recover them from?

I have an iPhone 12 Pro Max. It started happening when my storage began to get full. I've deleted things, but it still happens sometimes. I'm not using the cloud. It was set to sync to all events on my phone. Its not connected to an email.