Wikipedia Loves Libraries is a wiki-coordinated program of distributed micro-conferences (editathons) to be held at libraries and archives in cities across North America around October 2011. These events are also held “in sympathy with Wikipedians’ moral support of Open Access Week.”
One of the goals is:
Visit http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Loves_Libraries#West to see if a local event is already planned for your area. If not, Wikipedia encourages you to plan one. Another good place to check is at WP:MEETUP to see if there have been other wiki-meetups in your area in the past. If so, you could post there and ask if anyone is interested in a Library meetup in October.