Docs: Add user guide on seasion tickets

doc/user/events/guides/season_tickets.rst

@@ -0,0 +1,92 @@
+.. _seasontickets:
+
+Use case: Season tickets
+========================
+
+Season tickets and similar time-based tickets are popular for swimming pools, sports clubs, theaters and lots of other
+types of venues. In this article, we show you different ways to set them up with pretix.  Of course, other types of
+tickets such as week tickets, month tickets or tickets of ten can be created with the same mechanism.
+
+There is a big difference between the two ways we show below.
+
+With **Option A**, a customer who purchases a season ticket creates an account with their email address and a password
+and the season ticket will be saved in that account. If the customer wants to use the season ticket, they need to buy
+an additional free ticket for the specific event they want to visit. This makes sense for all events or venues with
+**limited capacity** or **reserved seating**, because it still allows you to set an upper limit of people showing up
+for a specific event or time slot.
+
+With **Option B**, a customer who purchases a season ticket receives a single ticket with a single QR code that can be
+used an unlimited number of times. This makes sense if the capacity of your venue is virtually unlimited and you do not
+need to know in advance how many season ticket holders will show up.
+
+Option A: Memberships and multiple tickets
+""""""""""""""""""""""""""""""""""""""""""
+
+Since this approach requires customers to be identified with a customer account, you first need to enable the customer
+accounts feature in your organizer settings in the "Customer accounts" tab.
+
+.. thumbnail:: ../../../screens/event/seasontickets_orgsettings.png
+   :align: center
+   :class: screenshot
+
+After doing so, a new menu item "Customer accounts" will also show up in the main menu of your organizer account on
+the left. Open it's menu and click on "Membership types". Then, select to "create a new membership type".
+
+You can name the membership type in a way that clearly explains where it is valid, e.g. "season pass main location"
+or "season pass all locations". There are a few details you can configure on this page, such as whether the season pass
+can be used by multiple different persons, or if the season pass can be used for multiple tickets for the same time
+slot. You can also define a maximum number of usages, which is useful if you e.g. use this feature to add a "ticket of
+ten".
+
+.. thumbnail:: ../../../screens/event/seasontickets_membershiptype.png
+   :align: center
+   :class: screenshot
+
+Next, you need a way of selling these season passes. Theoretically this can be done through the same event series that
+you usually use, but it's probably cleaner and easier to find for customers if you create a **new event** that you only
+use to sell season passes. The start and end date of the new event should correspond to the dates of your season.
+
+Inside the new event, you only need to create a single product which you can call "season ticket". Inside that product's
+settings, head to the "Additional settings" section and look for the option "This product creates a membership of type".
+Select the membership type you just created. By default, the checkbox "The duration of the membership is the same as the
+duration of the event or event series date" is active, which is fine for our season ticket example, but you might need
+to unset it and provide custom timing for other ticket types such as week passes.
+
+.. thumbnail:: ../../../screens/event/seasontickets_issue.png
+   :align: center
+   :class: screenshot
+
+To prevent confusion, it might be useful to turn off ticket downloading at "Settings" → "Tickets" for your new event.
+That's it, you are now ready to sell season tickets!
+
+We can now deal with how to use the season tickets. Move back to your existing event and create a new product
+**or** product variation of your regular product which you call "ticket for season ticket holders" and assign a price
+of zero. In the "Availability" section of the product or variation settings, check the option "Require a valid
+membership" and again select the membership type you created. You can of course repeat this with all events the season
+ticket holder should have access to.
+
+.. thumbnail:: ../../../screens/event/seasontickets_require.png
+   :align: center
+   :class: screenshot
+
+Option B: All-access in a single pass
+"""""""""""""""""""""""""""""""""""""
+
+If you have only a single event series with many time slots and you do not care how many season ticket holders show up,
+there's a solution that does not require your customers to set up accounts and book a new ticket on every visit.
+
+Instead, you can just create an additional product "Season ticket" that you enable either in a "special" date of your
+event series just created for this purpose, or in all of your dates so it can be easily found by customers.
+
+Then, you can set up your check-in lists with custom logic in the "Advanced" tab of your check-in list settings.
+The logic needs to ensure the following requirements:
+
+* Regular ticket holders can only get in during their assigned time frame **and** when they haven't used their ticket before.
+
+* Season ticket holders can always get in.
+
+Here's an example on how to set this up:
+
+.. thumbnail:: ../../../screens/event/seasontickets_rules.png
+   :align: center
+   :class: screenshot