In an Open Source Software or Hardware Project the READ ME file is the first one new arrivals to the project should read. The READ ME contains basic information on how to install the software and how the whole project and its contribution process is structured and also tells something about the objectives.
In this forum and in the OSCEdays we use this/suggest to use this technique to make organisational processes and structures transparent – as part of an Open Source workflow for organizing a community. A READ ME for a local event could show people what you do and make it easier for them, to help you/join you. Using the forum for your communication allows to shift a lot of things out of email and onboard people later easily without explaining the same things over and over again – just point them to the right threads.
Examples for groups that use READ MEs in this forums are:
The Berlin OSCEdays15 READ ME
The London OSCEdays15 READ ME
The global OSCEDays15 READ ME
screenshot of a README link in Git.