I only just heard about these. On 1 Feb (tomorrow) at 10am there is a masterclass for RAM students open to the public to watch:https://www.ram.ac.uk/whats-on/event/-a ... etrodarchi
Accordion Masterclass with Mario Stefano Pietrodarchi, Professor of Accordion at the Conservatorio Torrefranca, Vibo Valentina, Italy. Free, no ticket required.
On 2 Feb (Thursday) at 7:30 pm is a recital featuring Professor Pietrodarchi on bandoneon together with students of the Academy in a concert called The Art of the Tango.
These events have been superb and mind-expanding for me in the past. Even if the thought of watching someone have a music lesson sounds strange, the master classes are very interesting because they're all about how to get as much music as possible from the instrument.