The Obsidian Google Calendar API allows you to update events on your own.
The function updateEvent is publicly exposed so codeblocks from Templater or Dataview can access it.
Usage
The arguments of the updateEvent function is a GoogleEvent object and a flag if reoccurring events should be updated as well. This object has to contain the required fields listed in the Google Calendar API documentation.
The second argument updateAllOccurrences is a boolean that defaults to false.
If it is true and the event is reoccurring, it will update all occurrences of the event.
Example
<%*
const {updateEvent, getEvents} = this.app.plugins.plugins["google-calendar"].api;
const events = await getEvents({});
events[0].summary = "Updated summary";
await updateEvent(events[0], false);
%>