Decompose Event entity

[carltonwhitehead]

Event contains too much information. Decompose it.

Of particular concern is the Event.CrispyFishMetadata.peopleMap. Mapping a full Event (domain model) requires looking up every Person referenced by the event. This isn't necessarily inefficient when producing results for an event because those objects can all be used, but for a basic operation like listing Events, etc, it's super wasteful. Create a MinimalEvent (domain model) and replace Event usages with that where possible.