In public, in a social setting. College dining hall, school cafeteria, random coffee shop, party, club, grocery store, sports event where she is NOT competing, etc. Don’t approach people who are clearly busy or alone/vulnerable. Earbuds are a universal sign of leave-me-alone. People locked in exercising or studying don’t want their focus broken. Walking alone at night, I look at guys as either a threat or not a threat, so that’s a bad time for sure.
Eh, some people like to be friendly and social in the gym. But DEFINITELY do not approach someone in the middle of an exercise, or someone who has earbuds in. I’d say, only approach people in the gym if they are clearly making friendly talk. Or if you need a spotter or something gym related.