The "retention problem" isn't just relevant to new editors.  Retaining experienced Wikipedians is an equally substantial term in the equation. 

Back to Laura's question: I don't know about any research of Wiki meetups, but there's been research of everything2 meetups and potential effects on participation (from WikiSym'11).  See cite and free(ish) link below. 

Wyl McCully, Cliff Lampe, Chandan Sarkar, Alcides Velasquez, and Akshaya Sreevinasan. 2011. Online and offline interactions in online communities. In Proceedings of the 7th International Symposium on Wikis and Open Collaboration (WikiSym '11). ACM, New York, NY, USA, 39-48.  http://www.wikisym.org/ws2011/_media/proceedings:p39-mccully.pdf

-Aaron


On Sun, Nov 18, 2012 at 9:58 PM, Kerry Raymond <kerry.raymond@gmail.com> wrote:
I suspect that its only fairly well-entrenched editors who attend meetups, but I agree it would be interesting data. I rather suspect that meetups are advertised in ways unlikely to reach newer editors.

Sent from my iPad

On 19/11/2012, at 10:16 AM, Laura Hale <laura@fanhistory.com> wrote:

Hi,

I'm wondering if anyone knows of any research on Wikimedia meetups and the effects on editor retention?

Sincerely,
Laura Hale

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