This weekend, there were at least 8 cities that hosted Snuggie Pub Crawls that I know of.

April 17 – Laguna Beach, CA
April 18 – Pittsburgh, PA

Pittsburgh Snuggie Pub Crawl Photo Album on 96.1 Kiss FM. Big Bob reports they had approx. 150 Snuggie Pub Crawlers in attendance.
April 18 – Scranton, PA
April 18 – Minneapolis, MN (their 3rd Snuggie Pub Crawl so far)
April 18 – Portland, OR
April 18 – New York, NY (their 3rd Snuggie Pub Crawl so far – see SnuggieFest.com)
April 18 – Chicago, IL (their 2nd Snuggie Pub Crawl so far – see below)

The First Snuggie Pub Crawl in Chicago was held on February 28, 2009, with roughly 120 Snuggie Pub Crawlers in attendance, none of which were charged for tickets/admission. Here are photos from the first Chicago Snuggie Pub Crawl held on February 28, 2009.
This weekend, the second Snuggie Pub Crawl was held in the Windy City. Here are photos from this most recent Snuggie Pub Crawl in Chicago: