Dear all, due to several requests we decided to extend the deadlines for the R&I track. The new dates are as follows: Abstract Submission Deadline:     April 05, 2021 (11:59 pm, Hawaii time - originally March 22) Paper Submission Deadline:     April 12, 2021 (11:59 pm, Hawaii time - originally March 29) Notification of Acceptance:     May 17, 2021 (11:59 pm, Hawaii time) Camera-Ready Paper:     June 06, 2021 (11:59 pm, Hawaii time) For details please go to: https://2021-eu.semantics.cc/cfp Stay tuned and stay safe! With kind regards, Mehwish Alam & Paul Groth -- R&I Track Chairs --