Events: add data to api from pulled CSVs, following field names on spreadsheet

[karindalziel]

Add pulled down data from #220 to the API - there will probably be questions in this step about how the data will be manipulated

Airtable Column	API field	Interface Term(s)	browse, view	Notes
Event type	type	Type	browse
person.notpoet	person.name	People	view	no role
person.poet	person.name | person.id	browse, view	Browse: Poet View: African Poets	manually set role "African Poet"
topics-decade	topics	Decade	browse
places	places	Location	browse
spatial.region	spatial.region	Region	browse
Primary Field	n/a	-	-
Name	title	[item title]	view
Date not before	date_not_before		NONE	we might need to do a range for date not before - date, but current site doesn't have it so hold off
Date	date	Date:	view
Summary	description	[callout box]	view
spatial.country	spatial.city	Location:	view
spatial.city	spatial.country	Location:	view
Event type	type	Type:	view
commentaries_relation	relation	Commentaries	view
news_items	medium	News Items	view

[wkdewey]

person.notpoet and person.poet actually have dashes, person-notpoet and person-poet