On the street vs. In the street

On the street - generally has the meaning of positioned along the street or a line:

- His house is right on the main drag.
- There are many parks on that street.

In the street - means within the boundaries of the curbs:

- Don't play in the street.
- I saw two men fighting in the street.

References:
eslHQ.com

At vs. On

'On' is used when you refer to a particular day or one day of the holiday. On Wednesday,on Christmas, on Easter day, on Thanksgiving day.

- He came here on Easter day.
- We are going to start our trip on Christmas.

'At' is used to refer to the whole of the holidays at Christmas,New Year,Easter and Thanksgiving. So at Christmas means during the season in which Christmas occurs.

- We are going to take a trip to Brazil at Christmas.
- He stayed here at the weekend.

Note that British people say at the weekend, Americans say on the weekend.





Source:
English-test.net