Are the following sentences natural to a native ear?
1. Did you see who made it in today?Yes.
2. Didn’t we celebrate the Soccer day a few days back? The construction is fine but what is "The Soccer Day" or "Soccer Day"? If it's the title of a particular celebration in your country then you need a capital letter at the beginning of each word.
Didn't we celebrate Valentine's Day a few days back?
Didn't we celebrate Christmas a few days back?