For those in the Europe area, there will be a Cassandra Summit EU 2013 in London in the month of October. On 17 October, there will be the main conference sessions and the 16th and 18th there will be Cassandra workshops.
http://www.datastax.com/cassandraeurope2013 The speakers have been announced and the presentation abstracts are all on there. Like always, the presentations will be recorded and posted on Planet Cassandra, but it's great to meet and interact with people in the community - in my opinion that's the best part of any conference. Anyway, just wanted to make sure people knew. Cheers, Jeremy