Yearly or infrequent events

• The Core Contest is a six-week contest focusing on improving Wikipedia's most important and most viewed articles. Cash prizes will be awarded. The next (eleventh) contest will place from April 15 to May 31 2023... Entries at Wikipedia:The Core Contest/Entries.
• WikiProject Women in Green are hosting their fourth Good Article (GA) Editathon from June 1 to 30, 2023. Participants are invited to improve articles about women or women's works (e.g., books, films) and gain experience in the GA peer review process as either a nominator or reviewer. Both new and experienced editors are welcome – resources and one-on-one support will be provided. Participants are eligible for a barnstar at the end of the event.

Monthly or continuous events

• Monthly contest, WikiProject Military history. The contest department of the Military history WikiProject aims to motivate increased quality in military history articles by offering a form of friendly competition for project members making improvements to them. The primary contest available is a simple rolling competition that awards points for improving articles. The contest runs from the first to last day of each month.
• Guild of Copy Editors' editing drive . The May 2023 backlog drive is a one-month-long effort of the Guild of Copy Editors to reduce the backlog of articles that require copy editing; those carrying the {{ copy edit}} tag (also {{ awkward}}, {{ copy edit section}}, {{ inappropriate person}}, and {{ copy edit inline}} and their redirects) or listed on the GOCE Requests page. It begins 1 May 2023, 00:00 (UTC), and ends 31 May 2023, 23:59 (UTC).
• Wikipedia:WikiProject Women in Red 2023 Events: WP:WIR/EVENTS - updated monthly
• The 100,000 Challenge. The quest to bring about 100,000 article improvements and creations globally through a series of 50,000/10,000/1000 Challenges for different regions and countries. This is a loose challenge, a list will not be maintained here, but the components will function independently on each of the subpages. Will be updated every week or two.
  • The 50,000 Destubbing Challenge is a long term challenge to destub 50,000 articles on English Wikipedia for every country and topic. It may take decades to accomplish, it may take ten years, it all depends on how many people actively contribute.