ACCU - https://conference.accu.org/site/index.html
Meeting C++ - https://meetingcpp.com (9-11. Nov) not yet announced
ADC - https://adcpp.de/2017/
code::dive (not yet announced) https://codedive.pl/pl/index/
NDC Oslo - https://ndcoslo.com/
Audio Developer Conference:(not yet announced) https://www.juce.com/adc-2016
emBO++ (embedded C++)- https://www.embo.io/