Where can I meet girls my age group (20-28 )?

So I want to get into cold approaching girls and making small talk because while I have an active social life, I'm not interested in the girls in my social circle.

However, it seems like everyone is so busy nowadays. Free time seems to be spent at home, and door-to-door flirting sounds horribly awkward as well as patently ridiculous.

But meeting girls when they're busy (ie at their job or doing errands) seems like a bad idea too. So where can I meet girls when it's an okay time to talk?

Let's rule out some obvious answers though.
I'm unwilling to go to:
1. University campuses. (I haven't been interested in girls who like university culture, even when I was a student)
2. Bars (I don't drink and drinking is a red flag for me)
3. Clubs (drinking and party culture is a red flag)
4. Dating apps (they're just fake accounts and only make money from keeping you unhappily single)

But where else is there?
Where can I meet girls my age group (20-28 )?
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