The annual ACCU conference is being held in Bristol, UK for 2016. The call for sessions is currently open, to close 2015-11-13 (yes, it is a Friday
Although ACCU originates from a C and C++ background, and there is a strong C++ flavour still, it has over the years got solid Java, Python, C#, Ruby, Lisp, agile processes, and wider topics in the programme: it is fundamentally about professional quality programming and techniques.
If anyone in the Rust community would like to submit a session or two, I think it would be good to get strong Rust content established in this conference, for now and years to come.
The call for sessions is at http://accu.org/index.php/conferences/accu_conference_2016/accu2016_call_for_sessions