The FreeCodeCamp one is pitched as a self-hosted solution, which means it won't have a network of meetup groups like meetup.com does. If you have a big network

The FreeCodeCamp one is pitched as a self-hosted solution, which means it won't have a network of meetup groups like meetup.com does. If you have a big network of meetups yourself (like, say, FreeCodeCamp), then sure it works. If you're just a small meetup group, it'll be no better than just hoping people find your site on google as is.