Dear participants, We are glad to announce that the “Graph Neural Networking challenge 2020” has released the training and validation datasets and participants can now start working for the challenge. Please, visit the https://bnn.upc.edu/challenge2020 website to see all the details. Note that we offer some useful resources as a starting point for participants, including a baseline model (RouteNet) and an API to easily read and process the datasets. Before starting to work, you need to fill the registration form at https://challenge2020.bnn.upc.edu/registration. If you have any questions or doubts about the challenge, do not hesitate to use this mailing list. Thank you for your interest on behalf of all the challenge organizing members. Enjoy! Regards, José Suárez-Varela Barcelona Neural Networking center – Universitat Politècnica de Catalunya