An edit-a-thon is an event where some editors of online communities such as Wikipedia, OpenStreetMap, and LocalWiki edit and improve a specific topic or type of content. The events typically include basic editing training for new editors and may be combined with a more general social meetup. The word is a portmanteau of "edit" and "marathon". An edit-a-thon can either be "in-person" or online or a blended version of both. If it is not in-person, it is usually called a "virtual edit-a-thon" or "online edit-a-thon".

A Wikipedian in residence or Wikimedian in residence (WiR) is a Wikipedia editor, a Wikipedian, who accepts a placement with an institution, typically an art gallery, library, archive, museum, cultural institution, learned society, or institute of higher education to facilitate Wikipedia entries related to that institution's mission, encourage and assist it to release material under open licenses, and to develop the relationship between the host institution and the Wikimedia community. A Wikipedian in residence generally helps to coordinate Wikipedia-related outreach events between the GLAM and the general public such as editathons.