Other seminars take place in the group meetings. You will probably get this information if you are on the mailing list of your group.
In addition, there are early-career-organised informal seminars:
Paper discussions on Wednesdays from 11:30 to 12:30 (currently loosely organised by Eliot Jager, Alexis Lamothe, Luc Beraud): one person presents a paper and the group discusses
Career discussions every first Thursday of the month from 12:00 to 13:00 (currently organised by Clara Burgard): one invited person presents their life and career