As the demand for tickets is always very high, tickets were first distributed only to local groups, hackerspaces and people who helped out the last years with a viral system. You could only buy a ticket with a voucher, which then granted you another voucher to give to a friend. The presale for everyone was in October/November at some fixed times, but the tickets were sold out within minutes.
https://events.ccc.de/
As the demand for tickets is always very high, tickets were first distributed only to local groups, hackerspaces and people who helped out the last years with a viral system. You could only buy a ticket with a voucher, which then granted you another voucher to give to a friend. The presale for everyone was in October/November at some fixed times, but the tickets were sold out within minutes.
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