52 Handle parent events with no child events

[mattobee]

Shows an explanation when an event is expected to have one or more child events but the schedule has not yet been announced.

• If either the event is flagged as a parent (i.e. isParent is true) or the event has one or more child events associated with it, the 'accessibility highlights' section is displayed.
• If no child events are currently associated with the event, the count is replaced by a generic "accessibility events" heading and the explanation is displayed in the disclosure.
• if one or more child events are associated with the event, those child events are listed as before.

Fixes #52

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