Replacing the 20th Winter school on Mathematical Finance (cancelled due to Covid): Winter Seminar on Mathematical Finance, online. Lectures by Christa Cuchiero (University of Vienna), Blanka Horvath (Technische Universität München), Jan Obłój (University of Oxford), Gilles Pagès (Sorbonne Université), Mitja Stadje (Universität Ulm) and young talented researchers. Registration (without fee) and further information on the website.