Comment by degenerate

When you meet a stranger, the actual purpose of small talk is to try to find some common ground. Some people are better at it than others (I am horrible)... but if some common ground can be established, both people will have an easier time making conversation. That's why so many meetups are centered around an activity/topic. I would much rather attend a group of "20 random people that list kayaking as a sport they enjoy" than "20 random people".