We are proud to introduce Brite Ultra, the first system enabling ultra fNIRS hyperscanning of up to 30 participants at the same time in naturalistic settings. To celebrate this milestone, we will organise an online summer school highlighting the versatility of using fNIRS and EEG hyperscanning to study group interaction in various applications. Over 10 days, we will offer various online talks from researchers measuring inter-brain synchrony in different settings to demonstrate the potential and versatility of hyperscanning. Further, we will offer online demonstrations of our Brite Ultra system to study large group interaction in naturalistic settings, such as classrooms.