How do I create a Banner in GCal similar to MeetingMaker Banners?

GCal has an All Day Event feature that is similar to a Banner. All Day events are often birthdays, anniversaries, and any other event that does not require a specific time scheduled on a given day.

You can create an All Day event by checking the “All Day” box on the “Create Event” page. Alternatively, you can click in an open space in the All Day event section for a specific day, fill in the “What” field in the event bubble, then click Create Event.

When you’re viewing your calendar, All Day events are listed at the top of each day. You can choose to expand or collapse the section by clicking the triangle on the left side of the event grid. When the All Day event section is collapsed, you can view the All Day events for a specific day by clicking the shaded bar with the down-arrow (just beneath the date) for the day in question. A pop-out will appear, showing you all of the All Day events scheduled for that day. If an All Day event span several days, you’ll see the start and end date listed as well.

Additional information on All Day Events can be found here.