The scene at Union Square so far...
Some ralliers are scattered throughout Union Square, holding signs that say "equal rights for all workers" and "stop raids and deportations." A larger crowd is expected later this afternoon, though organizers expect a smaller turnout than last year.
Aaron Paez, a plumber from Mexico, said he's frustrated only three of his five colleagues took the day off to show up for today's rally. He said they're missing out on the opportunity to make a difference. Paez, 28, has been living illegally in the United States for 10 years and seeks legalization.
Meanwhile, there are several folks who have been selling flags throughout the park -- American, Mexican and various Central American countries -- $3 for the small ones; $10 for the larger ones.
-- By Ines Ferre, CNN en Espanol Correspondent