I would not recommend joining a Meetup group as the organisers can (and do) ban you for whatever reason with no recourse -daring to RVSP, changing your RSVP or even asking a question online and you're banned. Querying this with the organisers cuts no ice either as they'll ignore you and don't even bother going to meetup HQ itself as they'll point you towards the TOS which requires a law degree to interpret. You might do better if you've had to pay a subscription to join as then you'll have a contract with them but don't bank on it. A more un-user friendly association I've not met.