Well this website seems to thinks it’s all happening…
I’ll let the mods and admins decide what to do about the use of the Straight Dope name by a commercial website.
The rest of us can only boggle at the terms of service. The description of services offered seems somewhat vague, but reading over the website as a whole suggests that these people make their money primarily by promoting venues in which “meetups” are held.
It’s getting kind of surreal seeing the SD name popping up in odd places…
From the linked page:
Amazingly enough, we’ve mastered the necessary technology on our own. 
We believe it already has, thanks.
We kinda guessed that.
I’m kinda curious as to who set it up in the first place. Is it one of the first three members that joined (Kurtz, Hoyd, and Toby), or does meetup.com just make these things themselves, and wait for people to join in? It does make a difference.
FYI, there’s also an Live Journal “Meet Up Day.” I thought it was organized by LJ, but now I’m wondering. They have the same little icon (the name tag one) and they look very much the same.
That might be a place to start.
It might be that they seek out message boards and organize these social events on their behalf? I’m not sure.
I did a websearch, and it seems I’m correct. There are a lot of links to message boards and the “Meet Up Day” is on all of them.
Seems harmless, but what do I know, right? There’s a few in Amsterdam, too!
I think there are some Dopers/LJers who attended an “LJ Meet Up Day” this summer, you might ask them.
Weird! And why do they keep saying “memb” instead of “Member”? They couldn’t fit it all in?
Yes. Our members are just too big.
I’ve heard that about you, Coldy, from reliable sources.
Hehe.
“And now we have this report from our members-affairs correspondent, Heloise, who is live in Amsterdam. Heloise?”
“Yes, thank you, Cecil. The member situation here is staggering. The average member in this fair city is more than twice as long as anywhere else in the world. We’ve heard reports here of one man who has developed many uses for his member - he can skip rope, climb mountains, water the lawn, and rope calves in the prairie. In fact, the Guinness people were here earlier, and they say his member is – OH MY GOD, THERE IT IS! YIKES! LOOK OU–”
“Heloise? Heloise? … We seem to have lost our live feed from Amsterdam. And now, this word from Purina and the makers of Lifestyle Condoms…”
I just read there was a meet-up every first Wednesday in Dublin 
Yikes, dan. Let’s hope she doesn’t do vanity searches.
Sorry about that. Guess I let this coffee get to me.