What is the fine-grained topic of the following text: The session led by sensei Lukas Radwanski, 4th Dan triple World Champion, was designed to emerge the final team of athletes in the National Squad to participate in the oncoming European Junior Cup (21.10.2017, Poland) and European Championships (4-5.11.2017, Romania). Only return the topic.
Selection of National Squad for upcoming Karate European Junior Cup and Championships led by sensei Lukas Radwanski