Add presale information

docs/tickets.md

+# Tickets
+
+Tickets will be available for online presale (no local sales) at [tickets.events.ccc.de](https://tickets.events.ccc.de).
+If you have questions or need help, please contact us [via email](mailto:37c3-tickets@cccv.de).
+
+## Presale dates
+
+TBA
+
+## Ticket prices
+
+TBA
+
+## Presale phases
+
+The presale will have two phases. If you'd like to learn more about why we run our presale this way, head over [to our
+blog post](https://events.ccc.de/2023/10/11/37c3-presale-modus-operandi/#37c3-presale-modus-operandi-english).
+
+### Community phase
+
+From TBA till TBA (dates to be announced at [events.ccc.de](https://events.ccc.de)), tickets will be available for sale
+for community members with a voucher code. Vouchers will be given to
+
+- **Angels** (volunteers) who worked 20 hours or more during 36C3. Angels will receive **two** vouchers per person.
+  These vouchers guarantee one ticket per voucher for the full duration of the Community phase.
+- **Speakers** at 36C3. Speakers will also receive **two** vouchers per person. These vouchers guarantee one ticket per
+  voucher for the full duration of the Community phase.
+- **Groups** that are part of the Chaos community (registration deadline 2023-10-25). Groups will receive **one**
+  voucher that can be redeemed multiple times (up to an upper limit depending on the group). These vouchers do **not**
+  guarantee any tickets. Instead, they give access to the two presale dates that take place during the Community phase.
+
+### Public phase
+
+In the public presale phase, there will be another two presale dates. These dates are open to everybody and do not
+require a voucher code. The dates will be announced at [events.ccc.de](https://events.ccc.de).
+
+Please note that experience shows that you will need to be very punctual (think seconds, not minutes) to buy a ticket
+during the open phase.

mkdocs.yml

@@ -46,7 +46,7 @@ nav:
 #  - corona.md (Do not comment in yet)
 #  - location.md
 #  - timeline.md
-#  - tickets.md
+  - tickets.md
 #  - travel.md
 #  - 'Getting stuff there and back': parcel.md
 #  - facilities.md