In what period was the agenda originated?
During what period did the agenda first introduced?
During what period was the agenda arise?
At what time was the schedule initially invented?
In which period did the schedule initially imagined?
At what time was the schedule initially devised?
At what time did the calendar inception?
In which period did the agenda come about for the first time?
The History of the Advent Calendar from 1902 until now Jolablot
