This is an Editathon of Wikipedia articles on local history and community using library resources (possible help provided by local historical societies, and by Wikiprojects such as WikiProject United States and WikiProject Canada).
An edit-a-thon (sometimes written editathon) is an organized event where editors of online communities such as Wikipedia, OpenStreetMap, and LocalWiki edit and improve a specific topic or type of content, typically including basic editing training for new editors. They often involve meetups, but can be distributed as well. The word is a portmanteau of “edit” and “marathon“.
Wikipedia edit-a-thons have taken place at Wikimedia chapter headquarters, accredited educational institutions including Sonoma State University, Arizona State University, The University of Victoria in Canada; as well as cultural institutions such as museums or archives. The events have included topics such as cultural heritage sites, museum collections, women’s history, art, feminism, narrowing Wikipedia’s gender gap, social justice issues, and other topics
Visit http://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Loves_Libraries 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.