I don’t know if people still use Meetup, but back around 2013 when I was living in California, Meetup events were popular with people who wanted a way to socialize and improve their language skills. I was a part of a Meetup that went on hiking trips. I enjoyed the cultural exchange, but the foreigners who participated also told me that it was a good way to learn many of English’s colloquial expressions in a low-pressure environment.