By using the words ‘how was’ you are asking someone a question about something that happened or something they did in the past.
Here are some examples:
“How was your meeting?”
“How was your doctor’s appointment?”
“How was the birthday party?”
“How was lunch?”
“How was the airplane ride?”
“How was vacation?”
“How were your parents?”
“How were roads when you drove home?”
“How were people acting after what happened?”
“How were holidays with the family?“