Add Event Templates

[kevinreedy]

Once the data model is solid, we should add CSV and YAML "templates" that people can use to more easily add events. Perhaps we could even have a Google Sheet for non-technical people to use.

[kevinreedy]

Start of a Google Sheet with pickable values - https://docs.google.com/spreadsheets/d/1dIg6ruNYyb-bhZ7B6WSRPP0tRsQ9jEv1nyhMQRXgCfc/edit?usp=sharing