Bring valid ID. Tickets are generally non-refundable and not exchangeable.
Details:
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Age/ID: Admission is controlled; bring a valid government ID and ticket badge; SiGMA T&C's apply.
Terms (high-level): Tickets non-refundable, no exchanges; if event is rescheduled, your ticket remains valid for the new date.
Source: Agenda Central Europe, Terms & Conditions