Task: Add a event to Google Calendar automatically

n8n workflow:
{"id":"1","name":"Add a event to Calender","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[410,320],"parameters":{},"typeVersion":1},{"name":"Google Calendar","type":"n8n-nodes-base.googleCalendar","position":[830,320],"parameters":{"end":"2020-06-27T07:00:00.000Z","start":"2020-06-25T07:00:00.000Z","calendar":"shaligramshraddha@gmail.com","additionalFields":{}},"credentials":{"googleCalendarOAuth2Api":"new one"},"typeVersion":1}],"active":false,"settings":{},"connections":{"On clicking 'execute'":{"main":[[{"node":"Google Calendar","type":"main","index":0}]]}}}