The problem with publicly advertised meetups is the selection effect - they tend to be patronized by people who lack the social skills to make friends.
Of course there are also people with social skills who attend those meetups, because e.g. they're just new in town, but if they meet some other people with social skills they will probably become friends with them, start organizing private meetups, and drop out of the public ones.
Of course there are also people with social skills who attend those meetups, because e.g. they're just new in town, but if they meet some other people with social skills they will probably become friends with them, start organizing private meetups, and drop out of the public ones.