
The webpage is a bit like Facebook where you can create a profile with a photo for each group to which you belong and people can leave posts on your "shout out" wall. Depending on the group, there are periodic e-mail updates on the schedule of events. When an event is nearing you just RSVP - Yes, No, Maybe, and online you can see who has RSVPd. If you attend the event you're asked to rate it and provide a short comment.
I just think this is an awesome idea. Just last week I went to a Spanish meetup at California Tortilla in Clarendon, VA, not too far from the city. There were over 35 people there and the whole purpose was to just get to know each other and, of course, todo en español. Yesterday I met up with another Spanish group for intermediate/advanced/native speakers to play games on the Washington mall in between the Wash. Monument and the Capitol building. We had name tags and started the meeting by introducing ourselves. Because this is such an international city there were people from all over the states and world. the leader of the group is Argentine and there were people from Bolivia, Peru, Ukraine, Colombia, and obviously the U.S. We had a blast playing frisbee, peppering with the volleyball, and ending with a game of soccer.

What's so great about this type of social activity is that it's not the awkward encounter of meeting up with a friend who introduces you into his or her social circle and you stay the newcomer the whole time. Everyone is the newcomer in these meetup things because that's the whole point - to meet people. And then what glues it all together is that there is instantly something to talk about because the groups exists around a common interests, so obviously everyone can talk on that subject or participate in that activity. So I encourage you all to step out of your normal routine and go have some fun with some new people!