I searched on Oxford Dictionary to find the meaning of out. It has been said that to indicate a public place for purposes of pleasure or entertainment, out can be used. Then it gives a phrase as an example to explain this usage. The example:
- an evening out at a restaurant.
If I omit out, and rewrite the phrase as follows, what difference will it make, i.e. what are the differences between the first and second phrase?
- an evening at a restaurant.
A restaurant is always away from the house. If I omit out, a reader will easily understand that an evening has been spent at a restaurant, which is a public place. So why would we use out before at?