Write a blog post and send the link to sahana-eden@googlegroups.com.
The subject of the mail should be GCI Blog Post.

Have an introduction to Sahana and what it is, mentioning and providing at least two sentences of details each on at least 2 deployments. It will also need to contain details on your personal motivation to work with Sahana.

http://sunflower.sahanafoundation.org/eden/project/task/305/read