The phrase "a simple evening" is correct and usable in written English.
You can use it to describe an evening that is uncomplicated or relaxed, often implying a low-key atmosphere.
Example: "After a long week at work, I just wanted to enjoy a simple evening at home with a good book."
Alternatives: "a quiet evening" or "an easy evening".
It will be a simple evening, I think".
Given the price of a simple evening out, I figured that a doctor's visit would cost about the same as a customized van.
Had a simple evening in terms of defending Danilo 6 Coming in for William Carvalho, he took a while to get going.
Is it a simple evening with a vintage bottle of wine?
Clothing examples may include, simple skinny jeans, a well fitting blazer, ballet flats, long sleeved t-shirts, and vests in neutral colours, a figure hugging pencil skirt, ankle boots, a clutch, and a giant daytime bag, a trench coat, a plain day dress and a simple evening dress.
Only, as he blithely confesses, he had not the slightest intention of completing the work anytime soon, nor was he planning a simple afternoon at the movies.
By contrast, Rop seemed out for a simple afternoon run, his face impassive his torso leaning slightly forward, his stride as light and purposeful as the stroke of a painter's brush.
And much the way that families themselves have changed over the last few decades -- becoming more culturally, ethnically, economically and geographically diverse -- so has the family reunion evolved into a very different affair from a simple afternoon picnic held in the grandparents' backyard.
The latest drama began with a simple midday tweet last week indicating that Musk had secured funding to take Tesla private at a price of $420 per share.
There are parks for a simple afternoon outing, and others that can be a vacation destination.
Instead, most schools put together a simple night of games, tents on the football field and maybe a romantic comedy projected on an outdoor screen.
