Please check here to get late tickets: https://events.ccc.de/congress/2023/hub/board

Also, tickets this year weren’t that hard to get compared to previous years at CCH. You could buy tickets until Dec 9 this year (without vouchers) because lots of people clicked the order button but never paid and those tickets went back into the pool. Highly recommended to check the ticket page every day because this happens quite often.

Good luck next year!