The Europa Challenge was started in 2010 by two friends and is primarily run these days by Marie, a former bookseller and librarian. She is not affiliated with Europa Editions, and nor does she receive any compensation for running the Challenge. Europa Editions has been very generous in its support of the Challenge and occasionally will sponsor a giveaway or provide interviews or other material for the Challenge participants.
You can participate via Linky (see Join the 2015 Challenge) or by posting on the blog. If you would like to post on the blog, email firstname.lastname@example.org for instructions. Please be patient if it takes a few days to respond to your query.