CATCS is organizing a Wikipedia edit-a-thon at STOC in Phoenix this year. The goal is to create/edit Wikipedia articles on TCS topics that need improvement. (A crowdsourced list of such topics is maintained here.) The event will be held on June 24th, 2019 in West 104A, starting right after the STOC business meeting around 9-9:30 pm.
We invite members of the community to participate. Prior experience with Wikipedia is a plus, but is not necessary. If you are interested in participating, please fill out this form. Participants are asked to bring their own laptop or other device. Power outlets will be available. Light refreshments will be provided.
If you are interested in helping improve TCS coverage on Wikipedia but are unable to attend this event, please see this post for how you can help.
Theory Matters 
Great effort!