LatinoGAF sounds awesome. LOL.
and it's actually a really good idea, in my city we have some sort of comic convention twice a year, but it has become shittier and shittier with each year. I got a nice quantity of tags there, but it's still too random, and maybe I'm getting older, but I don't find the conventions really apealing anymore. Right now it's 80% Naruto merchandise, 10% memes craps, and 10% of whatever it's popular at the moment.
I have the same problem. I guess I'm just too old for this shit.
On the other hand, I think I'll just get my 3DS and camp outside of one of these anime conventions the next time. Because fuck paying for Street Passing. If only I had a car that I could park in front of the place and just chill for a bit..
Also, I've found a group that did monthly meetups for 3DS Street Passing using http://www.meetup.com/Nintendo3DS/ - Maybe you'll find some too.