My guess is that this editathon from earlier this year may be the biggest with about 230 people. Most of them participated remotely, so if you want to know the biggest editathon with people all in one room that'll be something different.

On 25 September 2014 13:05, Santiago Navarro Sanz <wikimillars@hotmail.com> wrote:
Hello! As you know, Wikimedia Spain will run an editathon next Saturday at National Library. We have at this moment more than 100 people registred for it, and we have to add wikipedians as volonteers and organization.

The question is, Do you know which was the biggest editathon ever? Biggest related to people attending it, editing at the same place and the same time. I know that the largest editathon in time was the 35 hours editathon organized by Amical, and this Saturday Wikimedia Mexico will run a new one of 50 hours.

Thanks

Santi Navarro

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