A time zone label would be great! My clients and I work across 3 time zones and a label will help keep us showing up in the same hour on the calendar. Outlook has a fabulous view that shows a column each for PT/ET/MT (my choices) side by side to the left of my calendar. This way I always know that we will show up during the same hour regardless of time zone - even if my client or I happen to travel to a different time zone for a particular meeting.