The next OpenStack Summit
will take place in Tokyo, Japan from 27-30 October 2015. The Call for Speaker period is open since some days and will close on July 15th, 2015, 11:59 PM PDT (July 16th, 08:59 CEST).
You can submit your presentations here
. I myself work currently on a proposal to speak about OpenStack and Ceph HA aspects.