Eliezer's post looks to me like:
How not to post a meetup:
Don't ask. It doesn't work when you ask.
How to post a meetup:
Pick a time, pick a place, commit to being there with an identifying book (like Demon-Haunted World or something). Worst case, nobody shows up. If anyone prefers meeting in another time or place, they can say so in the comments.
I am not seeing the problem here.
Perhaps the Spaniard and/or Catalan tropers, and those others who simply feel like visiting this wonderful city that is Barcelona, could meet here during Semana Santa, the Spanish Spring Break, which lasts from April 15 to April 24. We could decide on a date within that interval. I'm not trying to compete with Paris or anything, but it's really one of the most convenient times in the year for such an event to take place.
Don't expect any Ku Klux Klan lookalikes though, Catalonia just doesn't do that.