I saw this on WikiTree yesterday – WikiTree Announces Fourth Source-a-Thon October 4 – 7, 2019: https://www.wikitree.com/blog/wikitree-announces-fourth-source-a-thon/.
What is WikiTree? https://www.wikitree.com/wiki/Help:About_WikiTree
September 4, 2019: Registration opened today for WikiTree’s fourth annual “Source-a-Thon,” a 72-hour genealogical sourcing marathon. The event is scheduled for the first weekend in Family History Month (October), starting on the morning of Friday, October 4, and ending on the morning of Monday, October 7.
Family trees often start as oral histories. Events are retold as they are remembered by those who experienced them. These memories are incorporated into family trees and handed down through the generations. The genealogists who collaborate on WikiTree seek to preserve these family histories forever as part of a single family tree that everyone can access for free.
Unfortunately, oral histories and handed-down trees sometimes include mistakes. Conflicts arise when the trees are put together into a single family tree. The only objective way to resolve these conflicts is to refer to original source documents, such as birth, marriage, and death records.
To celebrate Family History Month, WikiTree members from all over the world will be working together around the clock for three days on profiles that don’t currently have any source citations.
This is the fourth annual marathon event. Of the 2018 Source-a-Thon, participant Neil Perry wrote, “I have to say, I really enjoyed it, and the fact that over 72,000 new sources were added to the tree is amazing! … everyone’s a winner.”
To support this event, individuals and organizations from around the genealogy community are donating prizes to be awarded at random. Over $3,500 in prizes have been donated so far, including DNA tests and full memberships from MyHeritage and Ancestry, as well as valuable prizes from Fold3, Newspapers.com, Legacy Tree Genealogists, Family ChartMasters, RootsTech and more. Prizes are still being added. If you would like to donate a prize, contact firstname.lastname@example.org.
To be eligible for the random prize drawings, participants must register in advance and get a “race number.” Registration is now open. See https://www.wikitree.com/wiki/Help:Source-a-Thon for further details.
WikiTree: The Free Family Tree has been growing since 2008. Community members privately collaborate with close family members on modern family history and publicly collaborate with other genealogists on deep ancestry. Since all the private and public profiles are connected on the same system this process is helping to grow a single, worldwide family tree that will eventually connect us all and thereby make it free and easy for anyone to discover their roots. See https://www.WikiTree.com.