Running order
The timed plan for the day: what happens when, where, and who needs to be there. Also called the order of the day.
Venues, photographers and toastmasters will each ask for one. The hard part isn't the times, it's the people: the best man who's also doing a reading and also driving Grandma.
Not to be confused with the order of service, which is the printed booklet guests read during the ceremony.