Calendar functionality

[wackerow]

Calendar functionality is currently limited and buggy with Airtable integration. Changes to events are resulting in a new event in Airtable, and this ends up displayed on the site.

• Fix calendar event storing/fetching to prevent duplicate events, and to allow events to be updated from the backend and still be displayed correctly.
• Also should have a "location" property for these events, even if it's a digital location in some cases.
• The "location" can double as our action link here, since we currently do not have one.
  Suggestion: If the event is virtual, place the URL in location, and use this as the action link. If the event is IRL, place the actual location, and link to a map.
• Make sure a few legit events are on the calendar and functioning appropriately before launch