It would be nice to be able to do more CSS configuration with the Calendar Card. week-planner-card by FamousWolf allows for access to many attributes and classes for custom CSS work. It also allows a variety of Calendar Classes to customize further. Natively this could easily replace Dakboard.
Examples:
data-entity
data-additional-entities
data-summary
data-location
data-start-hour
data-start-minute
data-end-hour
data-end-minute