Added description and a different icon for RegistrableEvent
Merge branch 'pr/icon-description'
FIX: load data from session

Reverts some changes in 6da91517e1a0292ad2aa9b147434fbe4abb2a5e3
Use new ORM api get()->byID
FIX: EventRegistrationDetailsController template doesn't have access to a TicketsTable field. Added template code to display directly.