Until the registration deadline in spring 2021, you are welcome to increase the number of participants at any time directly on your user account as a coordinating teacher. You will find instructions following this link. If some of your colleagues aren't sure yet, but you would like to register your students already, it is no problem at all to add your students colleagues to your registration afterwards!
For the transfer of the participation fee for the newly registered pupils (4,00 € per pupil) the same reference number must be given as for the original registration. You will find this reference number in the registration confirmation, which you can also download from your user account.