A month ago IWOCL (OpenCL workshop) and DHPCC++ (C++ for GPUs) took place. Meanwhile many slides and posters have been published online. As of today 23 talks are with slides.
The proceedings are available via the ACM Digital Library. This needs a ACM Digital Library subscription of $198, if your company/university does not have access yet.
IWOCL 2018 will be in Edinburgh (Scotland, UK), 15-17 May 2018 (provisional).