The EU-funded QCALL network is delighted to organise its final scientific event in the form of an online Symposium on Advances in Quantum Communications from 3 to 5 May 2021. We have arranged a series of exciting talks by world-leading experts in the field as well as emerging stars in our community to have three afternoons of talks and discussion on the latest developments in the field. The talks will be presented online and will be available for free upon registration.