Plat\al 2 Events
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Events are a way to organisze events with this website.
Users may have to pay to participate in an event.
Events have optional sub-events which can be free or not free.
Events and sub-events may have differents price options (e.g. student or not)


Current implementation
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- Event:
  - contains all the global properties of an event (visibility...)
  - has a foreign key to an EventPart that is the main event part.
- EventPart data specific to a part of an event (name, limits, price options)
  - they have a foreign key to the containing event.
- Price options with a name and a cost as well as a foreign key to an EventPart
- Registration of a user to one element of a price option (5 tickets make 5 Registrations)

The Event has no price options for the global event: it is handled by the main EventPart.
(this is done to not duplicate code for main price options and part price options)


Alternate proposed implementation
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Same thing as above except that price options are only for the main event.
That way the coee is a bit less ugly.


Alternate proposed implementation
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Have EventParts have a foreign key to the main event part. The "root" of the event becomes the main part.