I am currently living in the Pacific US time zone, but I may be doing a summer internship in Eastern time zone, which is 3 hours ahead. What will happen to the existing events when I change my time zone on Google Calendar? Will they remain at the same absolute time or will they shift 3 hours forward in absolute time so that they remain at the same clock time in my new time zone?
They will shift to match the time zone when you created the event. For example an event at 15:00 in pacific time will remain at 15:00 in pacific time, but in your new time zone will be shown at 18:00 in eastern time zone.