Every October/November, Wikipedia Loves Libraries launches its annual campaign of wiki-workshops and editathons at libraries (and related institutions) in the spirit of Open Access Week. Any Wikipedia-friendly event could fall under the umbrella of Wikipedia Loves Libraries. Here are some tried-and-true examples from past events. An event could incorporate activities from one or more of these suggestions, or other creative ideas.
meetup Simple but fun. Provide space at your library for local Wikipedians to hold a meetup. It is a good opportunity to get to know each other and plot the course for future Wikipedia collaborations with your institution.
backstage pass A tour of your facility; especially good if you have closed stacks or work spaces to show. Wikipedians are your online volunteers, serving your patrons’ information needs and improving access to and information about your collections. Why not treat them like volunteers?
editathon A working meetup. Invite Wikipedians to use your library’s resources for an in-person editing session, usually revolving around a preselected theme (like a particular library collection or a topic of interest to the community). A great chance to see collaboration in action, and work with the pros.
workshopA beginning Wikipedia literacy and editing workshop could be held for staff or as a public program. There are many Wikipedians with on- and off-line experience in teaching Wikipedia.
HEADS UP, TUMBLRARIANS!