The First European perfSONAR workshop brings together perfSONAR user and developer communities to explore use cases for the toolkit, to share best practices, and to discuss future features and the development roadmap. The workshop will run from 10am to 5pm BST on both days. If you are interested in presenting, please email tim.chown@jisc.ac.uk. The event will be followed by a developer debrief on 7th June, for which there is a separate registration page.