350 visitors have registered for Pi and More 10½ already, so unfortunately there are no more tickets available. We would like to give more visitors the chance to participate in Pi and More, but we are bound by safety requirements that limit the size of the event. If you haven't got a ticket yet, we recommend our newsletter (so you'll be able to register earlier the next time, see right) and the live stream of the talks that we will be offering here on Saturday.