Event meta data

[japsu]

On the Conikuvat.fi site, top level albums usually represent one event. We should add the option for basic event meta data for event root albums:

• Event name
• Venue
• Starting and ending dates
• Event logo

These events are often managed using the Kompassi (GitHub project) event management system, and the basic event information should be imported from there. Perhaps just add a Kompassi event slug to an album and have other info automatically imported from Kompassi API (cached, of course).

Later we could support CSS customization by event etc.

[japsu]

Covered for now using Series and album dates. Will re-evaluate later if actual event metadata is necessary.