'almost forgot [event]' vs '[event] is now fading from our memory'

[snooprun]

What about these two senteces, which one do you believe is more idiomatic——1. We almost forget this event.
2. This event is now almost fading from our memory.
Many thanks.

​

 

[Copyright]

They mean two different things, so you can't choose based on your question:

We almost forgot this event. We nearly forgot we were supposed to go; lucky we remembered at the last moment. Or, looking through a photo album, you might point to a picture and (maybe) say this.

This event is now fading from our memory.
This event has almost faded from our memory. We barely remember this event -- soon we may not remember it at all.